This desktop charger supports wireless transmitters and receivers within the Assistive Listening WS-series of products. It charges up to four units at a time and can be daisy-chained with two other WS-CH chargers to recharge up to a total of twelve units. The power adapter (WS-CHP) for this must be purchased separately.Output to daisy-chain an additional charger LED indicator for each of the 4 charging stations Power input Four connections for recharging WS-T (transmitter) and the WS-R (receiver)