The LSH20 is a primary 3.6V Lithium battery which offers high voltage response manufactured by SAFT. The battery is packed and sold individually. Four batteries (two for the transmitter and two for the receiver) are needed for the battery-powered AX- and SL- models and the SL series is able to accommodate a maximum of eight batteries (four in each beam) to extend the operation life.
Visit the Optex Europe Ltd website for more information on LSH20 Battery (for IR Beams)