Nikon's WR-R11b/ WR-T10 Remote Controller Set is the perfect way to wirelessly control your Nikon camera or radio-controlled flash unit. The WR-R11b Wireless Remote Controller fits cameras with an accessory port, and can be triggered by the WR-T10 Wireless Remote Controller (transmitter), a WR-1 Wireless Remote Controller, or used on a designated master camera to trigger up to 64 transceiver units. The three radio frequency channels on the WR-R11b are available for use (5, 10, and 15) to prevent interference when multiple pairings or photographers are shooting in one location. The WR-T10 is a Wireless Remote Controller (transmitter) that is designed for use with Nikon's radio-controlledflash units, and has a range of up to 98 feet (30 meters). It operates on two AA batteries (not included).