Transparent heat generating head that allows to see the firing LEDs to check the operation of the temperature detectors up to 90ºC / 194ºF. The heater is activated by infrared cell. Battery stop 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 SOLO-770 (Batteries). 1 SOLO-725 (Rapid battery charger powered at 220 VAC or 12 V with cigarette lighter socket).