1) It has compact, small and innovative design, giving you all-around security, 2) It can be used for at least 1 year, avoid the trouble of changing battery frequently,< /li> 3) The loud alarm can effectively deter the thieves, 4) Remote control, more convenience. Easy to use and install, 5) Flexible Options: If you need extra remote controls for family members or just for spare parts. Please refer to More Remote Control in the Notes and Promotions. Product Information Home Security Door Window Burglar Alarm Thanks for coming, it deserves the best! This is Home Security Wireless Door Window Burglar Alarm. It can be widely used in home, shop, office and other needed places. 105db Super Loud Sensor Alarm Tiny and fashion design. This burglar alarm is specially designed for single apartment, rental apartment, shop, mall and apartment building. Once triggered, 105db super loud warning will be a great deterrent, can effectively scare away fear. Power supply: Low-consumer design, which makes it can work for a long time. Host battery: 2 * AAA alkaline batteries (not included) Remote control battery: 12V / 27A alkaline battery (included) Avoid mistakes when opening the security alarm When baby / children try to open and climb balcony windows, will the loud voice will stop them and alert parents. Not only a security alarm, it also works as a doorbell, it will bell dingdong to greet you. Size & Weight Item Size: 8.5* 4.2 * 1.4cm / 3.3 * 1.7 * 0.6inch Item Weight: 37g / 1.3oz Package List: 1*Host, 1*Magnetic Bar, 1*Remote Control, 1*User Manual Three Main Features Easy Installation There are double-sided adhesive on host and magnet bar, just peel and stick to install them on the door, window or anywhere. Please note: 1) Make sure the 2 parts are aligned on the scale, 2) Distance between them is about 10mm. Easy to use 1) Arm button: Press it, once triggered, alarm will ring 105db voice, 2) Disarm button: Press it, the arm status or loud voice will stop, 3) SOS button: Press it under arm status, the alarm will ring 105tb voice even though host is not triggered. This function will be very helpful when someone is in danger or needs emergency help. 4) Doorbell button: Press it, once triggered, it will bell dingdong to warn you someone is coming in. More Options< br> 1) The extra remote control and alarm need to pair, 2) One remote control could control many alarms, 3) One alarm could be controlled by at most 8 remote control. If you need more remote control, search simply MS-AR01. See the remote control description for the command instructions.