... place: >250m, indoor: 30~50m, (depend on the surrounding environment and wireless interference)4. Standby current: < 15mA5. Alarm volume: internal ... : wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote control, all ... customer's side to China should undertake by customer,and fromOur side to customer's should undertake by us.