This is the Hitec 2.4GHz DSSS Spectra Module for Surface Use. FEATURES: Compatible with all Hitec/Futaba module type surface radios LED status indicator Smart Link system for easy and fast linking Two year limited warranty through Hitec beginning at date of purchase INCLUDES: Hitec 2.4GHz DSSS Spectra Module with Instruction Sheet REQUIRES: Installing in rear of transmitter SPECS: Dimensions: 2.3 x 1.5 x 0.79" (59 x 37.3 x 20mm) jxs 05/19/11 ir/jxs