1.what is the difference between 315MHZ and 433MHZ?
Answer: This only the wiless frequency, Most all the countries can be work with 315MHZ and 433MHZ, and most of the client take the 433MHZ. 
2.can the alarm panel work with the gas detector/the smoke detector? 
Answer: yes. it can work with a lot of the door sensors. pir sensor,gas detectors and smoke dector. 
3.what's including  in one set? 
Answer: the alarm panel, one pir sensor, one door sensor, one wired siren, and two remote rontrols.
4.Remotes and detectors supplied seemed to be already configured with the system. How can I tell how the remotes and detectors have been configured with a system? 
Answer:Yes,the remote and detector in the standard package is already configured with the system.if you want configured the detector and remote,you can remove them from alarm system first and then add it again! I am sorry,kr-5800G can not query the detector or remote add which zones,but you can trigger it and find which zones is alarm 
5.The wireless distance from the detector to alarm system panel?
Answer:The wireless distance is 300-500M in the open area,if the wall and floor is more,the distance will be reduces.
6.When alarm occurs I get SMS on phone number stored to receive SMS message but the voice alarm phone number does not occur straight away.
Answer:This is the normal condition,the factory default set is SMS message faster than voice call .The call will received later.  
7.If I lose electric power, will my alarm system still work?
Answer: Yes. In case of a power loss, the back-up battery will activate to maintain your alarm protection for several hours. 
In the event your battery is low, a low-battery msg will be sent to your mobile phone so you can be notified.

8.Why is my motion sensor providing false detections?
Answer: A motion detector may activate falsely for several reasons. It could be the result of improper installation of the device, such as placing it above a heater or furnace. A false detection could be caused by the movement of objects such as balloons, blinds, and curtains within the range of a motion detector.
9.Why does my alarm system take so long to be notified.
Answer: The alarm system provides a delay period.
10.What is a Zone ?
Answer: Generally, a zone refers to an alarm control panel's input from a protective circuit. It divides your alarm system into separate independent areas of protection based on function. Those functions might include intrusion, fire, medical, panic, or critical condition monitoring.A zone can consist of a single contacted point such as a door or an entire room of windows. It could refer to a single device such as a motion detector or glass break or reference a complete circuit such as a fire alarm. Generally speaking, an alarm panel's zone inputs are closed circuits, meaning they begin at the alarm control and terminate there on a single pair of wires.
11.How do I determine how many zones are needed on my security alarm system ?
Answer: In a perfect world, every alarm system device would be connected to it's own panel zone. However, economics and practicality dictate otherwise. When selecting a system, be sure to consider the amount of expansion the unit is capable of, if any, as well as the method of expansion supported, since some equipment is inherently limited. In this case, the adage about "more is better" usually applies. When designing a system, always attempt to powered devices such as motion detectors and glass break detectors on an independent zone. Don't combine different forms of protection on the same zones, such as interior devices and perimeter devices. Perimeter doors and windows can be combined, but consider how you would like the zone to perform (programming). Also keep panic alarms, critical conditioning monitoring, and life safety devices separate and independent from any burglar alarm zone.
Combining contacted points onto zones is a common practice, but again, the limiting factor is the amount of zones vs. the amount of contacts installed. Generally, it's wisest to single each door out and combine window contacts by room, general area (IE: front of house, basement perimeter) but keep in mind, the more devices wired per zone, the harder it is to troubleshoot a false alarm.
Windows and certain doors present a unique challenge, as some people would like to leave them open while the alarm is armed. Doing such, sometimes is possible depending on contacting methods used while installing, but again, pay attention if bypassing certain devices or zones would be common, as a security loophole would be created. There are methods of securing partially open doors and windows, which must be considered while designing and installing your system.
Fire alarm on a burglar alarm panel usually dictates a single zone, observing proper wiring methods, however some panels can support multiple fire zones or zone definitions. Usually the advantages of splitting a fire zone to its individual devices are moot in a residential situation.
If you are considering a larger integrated security solution with outbuildings and partitions, pay close attention to the system's zone capabilities, as when multiple buildings are secured, the number of available zones decreases significantly.
Also, in this case, the method of wiring, as well as the available number of zones may also help in troubleshooting your alarm system in the event of a malfunction, as well as limit the amount of devices disrupted should a malfunction occur

12,Can I connect more than one motion detector or glass break on a single zone ?
Answer: You can connect multiple sensors on a single zone; however, good system design should dictate the devices that are grouped.
It is not recommended that more than a single powered device (GB, PIR, etc.) be connected on a zone if at all possible. Doing so not only makes it harder to isolate potential false alarm issues but also reduces the value of information provided in the event of an alarm. Similarly, different types of protection should not be intermingled, such as a PIR and a door contact or a glass break.
Contacted points or perimeter devices can be combined as needed. Windows are commonly grouped by room, doors can be grouped but if so, should be in close proximity to each other.
Fire devices should only be combined with other fire devices. Critical condition monitoring devices can be combined, provided they serve the same purpose, but different monitoring functions, such as temperature detection and flood detection should not be combined.
While the purchase of a commercial grade alarm system with each device and contact is on it's own individual zone is not necessary, some forethought in system planning will yield better end results.

13,Where should I install the control panel for my alarm system ?
Answer: There is nothing set in stone, other than code requirements (if applicable in your installation) and common sense. Keep in mind, this is sensitive electronic equipment that will require periodic maintenance, as well as potentially be upgraded as it ages.The National Electrical Code sets safe working spaces and distances for headroom, as well as on each side and behind where someone working would be standing. If you are in doubt of location, reference the NEC as well as your local authority having jurisdiction (AHJ).

Some good rules of thumb would be:
Install the control panel within a protected area to avoid compromise.Install the unit with enough space to comfortably work on it.Install the unit with adequate light to work on it.Install the unit in an area, which is accessible without special equipment.Install the unit within a cool, dry area.Install the unit using all the factory mounting holes.
Follow the manufacturer's directions for temperature rating and proper mounting methods, use proper anchoring and mounting methods and plan for additional space for expansion, upgrades, or changes.

Attics and extremely hot or humid areas.Areas subject to flooding or moisture.Areas exceptionally close to gas mains.Areas directly beneath plumbing.Mounting the unit directly on concrete without an insulator or fiber washers.Mounting the unit in an area which may be subject to remodel or change.Mounting the unit where it is subject to damage and compromise.Mounting the unit outside.The use of Velcro, double sided tape, or even caulk to mount the unit.
Normally you will see a control panel mounted in a basement, utility space or closet. At times, due to installation demands, none of these are an option, so compromises are made. Your personal installation will also dictate which locations are not suitable.