This is the Futaba R614FF-E 2.4GHz 4-Channel FASST Receiver for use with the 4PK and the 4PKS Radio Systems in electric vehicles only. FEATURES: Normal and high-speed modes for analog or digital servos including the BLS series One year limited warranty through Hobby Services beginning at date of purchase INCLUDES: Futaba R614FF-E 2.4GHz FASST 4-channel Receiver with Instruction Manual SPECS: System Compatibility: FASST-C2 system at Normal/High Speed (auto detection) Receiving Range: 230" (70m) under best conditions Power Requirement Rated Voltage: 3.7-7.4V, Usable voltage 3.5-8.4V Dimensions: 1.38 x 0.91 x 0.35" (35.1 x 23.2 x 9.0mm) Weight: 0.27oz (7.6g) COMMENTS: Futaba FASST system does not work with current Futaba S-FHSS/FHSS systems. This receiver is for use with electric vehicles only. jxs 08/09/12 ir/jxs UPGX1/22/13