Features:

Smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible and/or visual alarm from the detector itself.

Specifications:

Battery: DC9V ( included)

Alarm sound:>80Db ( within 3m)

Working temperature:-10°C~55°C

Working humidity: <95%RH

Wireless frequency: 433MHz

weight: about 135g