This is the 75MHz Futaba R143F 3-Channel Micro FM Receiver. FEATURES: Fail Safe system returns throttle to preset speed in the event of a radio glitch or interference Ideal for use in any nitro powered buggy, sedan or truck INCLUDES: One 75MHz Futaba R143F 3-Channel Micro Receiver REQUIRES: One Short FM receiver crystal use FUTL6461-90 Or a Futaba Single conversion crystal such as FUTL52**. SPECS: Length: 1.7" (43mm) Width: 1.1" (29mm) Height: 0.6" (14mm) Weight: 0.6oz (17g) COMMENTS: The R143F receiver cannot be used with dry cell or NiMH batteries. These batteries cannot endure a large current draw and the voltage will drop frequently even though the battery is new jxs 11/16/05 ir/jxs