The HTC PSD II- 75 DB atl m is compact and easy to use. It operates within the temperature of -20 degree Celsius to 60 degree Celsius. The 35 KV personal safety voltage detectors help by detecting the electric field of high voltage. The personal safety voltage detector is used to check the power in electric switch boxes and wiring before the work is started or to detect live electricity at levels between stated voltage capabilities. Product Attributes: Frequency - 50 to 60 Hz Weight - 40 g. Voltage - 35 KV Volume - 75 dB atl m Batteries - 2 Alkaline Height - 60 mm Width - 52 mm Battery life - 50 hours