Features:- Alarm sensor wristband for emergency or people alone at home
- Support 433MHz radio-frequency
- One key to arm when emergency
- Transmitting distance can be up to 100m in open area
- Fit for Escam QF502 / QF500 / QF521 / QF510 camera
- Lightweight plastic housing and soft rubber wrist band
- Adjustable band fits for most people

Specifications:
Working voltage: DC 3V ( 1 x CR2032 button cell )
Standby current: under 1uA
Alarm current: under 10mA
Transmitting distance: up to 100m ( in open area )
Output: 10dBm
Emit frequency: 433.92MHz door sensor 0.034 Package weight: 0.058 kg
Product Size(L x W x H): 24.30 x 4.20 x 0.80 cm / 9.57 x 1.65 x 0.31 inches
Package Size(L x W x H): 12.00 x 5.00 x 2.00 cm / 4.72 x 1.97 x 0.79 inches Package Contents: 1 x Alarm Sensor Wristband