Pinpoint heat sources up to 300 yards away. Like a metal detector for heat, this may be the most valuable tool you will ever own. Built in laser sighting makes acquiring targets easier. It can be turned on and off. Adjustable volume for when silence is critical. Runs on one 9v battery, which is included. High impact ABS plastic construction. It is 7" long and weighs just about 8.25 oz. Includes belt pouch, earphone and wrist strap.