2 Tone indoor sounder, 101dB to 1m. ABS white plastic. Self-supply possibility (battery 10,8V / 280mAh Ni-Cd, not included). Tamper againg opening and burst. Vertical or horiontal mounting. Operating temperature from -25ºC to 55ºC. Dimensions: 155 x 114 x 44 mm. Security grade 2 certified.