These remotes are compatible with the D7100:
The MC-DC 2 Remote Cord : Plugs into the D7100 accessory terminal.
ML-L3: Connects wirelessly with the D7100 when the camera is in Remote Control Mode. See D7100 Manual page 127-129 for details.
WR-T10 transmitter and WR-R10 transceiver: These are used together. The WR-T10 transmitter triggers the WR-R10 transceiver which plugs into the D7100 accessory terminal. See D7100 Manual page 130 for more information.
WR-1 tranceiver: This must be used with another WR-1 or with a WR-R10 plugged into the D7100's accessory terminal. See D7100 Manual page 130 for more information.
A copy of the D7100 manual can be downloaded from this address:https://support.nikonusa.com/app/an...