FIT FOR: keyless entry owner who wants to upgrade it to a simple car alarm so it has more functions besides locking/unlocking doors. MAIN FUNCTIONS AND FEATURES: 1. Arm / disarm / lock / unlock remotely 2. Mute Arming / Automatic (Re)-arming 3. Shock sensing and alert. 4. Trigger ( intrusion) Record 5. Emergency Override 6. Unclosed door warning 7. Power-cut-off memory 8. Power window output 9. learning code EXCEPTIONAL CHARACTER： 1. no transmitters are furnished with this car alarm, so it is cheaper than a normal car alarm. it saves money, also it is best choice for those who don?t want to discard their transmitters they are fond of . COMPONENT PARTS: 1.Main control module 2. wire harness 3. 6-tone siren 4. LED light 5.Re-set switch (red switch) 6. engine cut-off relay with socket. 7. shock sensor. PACKAGE INFORMATION: Color box measurement: 22 x 14.5 x 9.5 cm Carton measurement:43 x 26 x 40 cm 12 unites / carton 7520 unites/ 20ft container