This is the TQi Telemetry Expander 2.0

Features:
Installs quickly and easily; no parts to replace or swap
Waterproof case keeps the expander safe from the elements
Six available ports for connecting auto-detectable plug and play sensors

Includes:

(1) Telemetry Expander 2.0
(1) Receiver data cable (optional data cables available)

Requires:
Plug-in GPS Speed Module (part #6551X, sold separately)
TQi radio system with Wireless Module (TRA6511)
TSM receiver (TRA6533)
Apple device running iOS 4.3 or higher or Android-equipped device with Android 4.4 and higher
Tthe Traxxas Link App (latest version available free on Google Play and the App Store)

This product is compatible with the following Model(s): X-Maxx,X-Maxx-Store