Detailed Product Description Wireless burglar alarm system Features: Smart looking, Small size. DIY. 1. Protection ... 200m, indoor: 30~50m, (depend on the surrounding environment and wireless interference) 4. Standby current: <20mA 5. Alarm volume: external ... 120 degree horizontal+60 degree vertical 10. Optional sensor: wireless smoke detector, gas leakage detector, vibration sensor,siren with ...