Nikon's WR-R10/WR-T10/WR-A10 Wireless Remote Adapter Set is a complete remote control set designed to wirelessly control the shutter release of any Nikon DSLR camera. The WR-T10 transmitter can trigger any number of Nikon DSLRs that are equipped with a WR-R10 transceiver (one WR-R10 included). For DSLRs with a 10-pin connector, the included WR-A10 adapter is required for using the WR-R10. The WR-T10/WR-R10 units use radio frequencies to communicate--three frequencies are available to avoid interference when multiple pairings or photographers are shooting in one location.
Line of sight from the WR-T10 to WR-R10s is 66 feet (20 meters)
Line of sight) from WR-R10 (used with the WR-A10 WR adapter on select DSLRs and acting as a master unit) to WR-R10s is 164 feet (50 meters)