Universal Pairing Receiver-

The Dell Universal Pairing Receiver WR221 connects compatible Dell keyboards and mice to a computer through one receiver. It is designed for devices that support Dell Universal Pairing, making it useful when you want to use several compatible peripherals without a separate receiver for each.

The receiver connects through four-pin USB Type-A and communicates over 2.4 GHz RF. It can pair with up to six compatible devices, which can share the receiver. Its compact dimensions are 1.42 cm wide, 1.99 cm deep and 0.66 cm high.