This is the Futaba 2.4GHz R603FS 3-Channel Receiver with FASST Technology for use with the 2.4GHz FASST Tx Module for the 3PK/S & 3PJ/S Radio Systems. FEATURES: Unlike less reliable single antenna receivers, Futaba employs antenna diversity-one internal and one external antenna on the R603FS receiver to eliminate dead spots anywhere on the track Receiver has Auto-Detect function to determine which mode-HRS or PPM is active One year limited warranty INCLUDES: Futaba 2.4GHz R603FS 3-Channel Receiver REQUIRES: Futaba 2.4GHz FASST Tx Module SPECS: Reception Antenna: Diversity type (internal and external) Power Requirement: 6V NiCd battery DSC Function Available Size: 1.5 x 1 x .55" (39 x 26 x 14mm) Weight .50oz (14.1g) jxs 10/12/06 ir/jxs updated11/16/06kkh