This is the 2.4GHz FASST R614FS 4-Channel Receiver used with the Futaba 4PKS Surface Radio System from Futaba. 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: 2.4GHz FASST R614FS 4-Channel Receiver with Instruction Manual Internal and External antennas SPECS: Size: 1.38 x 0.91 x 0.33" (35.1 x 23.2 x 8.5mm) Weight: 0.28oz (7.8g) Operating Voltage: 3.5 - 8.4V Current Drain: 135mA or less COMMENTS: Futaba FASST system does not work with current Futaba S-FHSS/FHSS systems jml 10.25.12 jxs 02/29/12 ir/jxs