The main features of the GP328 explosion-proof radio Signalling - Quick Call II, DTMF, limited MDC1200 emergency call button battery life - 8 hours (High Power), 10 hours (low power) - the use of standard high-capacity Ni-MH battery Frequency - 136 - 174 MHz / 330 - 400 MHz (only use 16 channels) / 403 - 470 MHz / 450 - 527 MHz 2 Power Output - 5W - 136 - 174 MHz, 4W - 403 - 470 MHz, 450 - 527 MHz 3 channel capacity - 16 4 Dimensions (length X width X thickness) - 137 mm x 57.5 mm x 37.5 mm (with standard nickel-metal hydride battery) Weight (g / kg) 420g (with standard nickel-metal hydride battery)