GAMMALARM 500B Radiation Activated Area Warning Device
When switched on, an amber light flashes to give a pre-exposure warning. When the source is exposed and the doserate exceeds 7,5 microSv/h, the amber light goes out and a red flashing warning light indicates "Radiation Present". There is also a manually triggered audible siren which can sound when the amber light is on. Powered by rechargeable battery. Supplied with charging lead for connection to 230V AC.