Features: -Specially design for bicycle electromobile security door and window alarm-Wireless remote control to arm or disarm.-Compact、 wireless、 easy to install.-Low power consumption、 lasting one year. Free to change batteries frequently.-Powered by 2 pieces of AAA alkaline batteries.-Super loud alarm of 105dB、 scare thief away-Can easily mount to windows or doors with included double sides adhesive tape、 no tools required.-Door bell function、 reminding people in house open door for you. Specifications: Alarm size: 85 * 43 * 10mm / 3.3 * 1.6 * 0.4inAlarm volume: 105 dBHost Battery: 2 * AAA alkaline battery operation (included)Remote control battery: 1*27A12V ( included )Remote Control Distance: about 30M without barrierBattery life: more than 1 yearMaterial: ABSPackage Details: 1 * Receiving host2 * Remote control