New to the 2000 series, This two-bay recharging station provides power to recharge NiMH batteries in two atw-t220a handheld transmitters and/or atw-t210a unpack transmitters in any combination. Maintenance charging prevents battery self-discharge until the transmitter is removed from charger. The charger draws power from a standard wall outlet. Features: NiMH batteries are charged within the transmitters versatile unit charges atw-t220a handheld transmitters and/or atw-t210a unpack transmitters (in any combination) built-in safety feature monitors cell voltage and automatically turns off the unit if problems are detected automatic shout-off if alkaline (non-rechargeable) batteries are installed automatic shout-off if damaged batteries are installed maintenance charging prevents battery self-discharge until the transmitter is removed from charger specifications: compatibility: atw-t220a handheld transmitter, atw-t210a unpack transmitter.