1. Power: 12V DC.
2. Current: about 25mA @ standby, 135mA @ activation.
3. Back-up time: 30 hours @ standby.
1. Siren output: 108+/- 3dB. 2. Size: 50 x 160 x 240 mm. 3. Weight (w/o 12v/240v adapter): about 618 g. 4. Red light option for fire alarm or medical alert.