Traxxas 6507R TQi 2.4 GHz High Output 4-Channel Radio System with Traxxas Link Wireless Module, TSM 4-channel TQi Transmitter features model memory for up to 30 models with simple 2-button programming Interface and built in failsafe Includes #6511 Traxxas Link Wireless Module for Traxxas Link App expandability with your mobile device 5-channel receiver with Traxxas Stability Management (TSM) accepts optional telemetry sensors Traxxas Link app provides visual access to real-time telemetry and customizable dashboards on your mobile device Direct Sequence Spread Spectrum Technology (DSSS) uses only 4 AA batteries