Transparent heat generating head that allows you to see the trip LEDs to check the operation of the temperature detectors up to 90ºC / 194ºF. The heater is activated by infrared cell. Battery cut-off protection at 120 seconds, reset at 5 minutes. Powered by rechargeable batteries that fit between the head and the SOLO-100 extendable pole. Autonomy for 50 tests of 30 seconds. It consists of the following elements: 1 SOLO-460. Heat generating head 2 ONLY-770. Batteries 1 ONLY-725. Fast battery charger powered at 220 Vac or 12 V with car cigarette lighter socket.