This is the Traxxas Link TQi Wireless Module.                                                                                                  FEATURES: For use with the Traxxas Link app and TQi radio system Compatible with iPhone (4S or later)                                                 iPad (3rd gen and later)                                             iPod touch (5th gen and later)                                       iPad mini                                                            Allows driver to view real time telemetry with optional sensors (sensors not included)                                                                                                                              INCLUDES: Traxxas Link TQi Wireless Module                                                      1.5mm Hex Wrench                                                                      1.5x5mm Hex Head Screw                                                                                                                                SPECS:    Dimensions: 1.2 x 1.8 x 0.42" (31.5 x 46.8 x 10.8mm) Weight: 0.26oz (7.5g)