The new sr4s remote control is the basis for every model fan who prefers to operate a joystick rather than reach for the steering wheel and is also the successor to our incredibly popular ""sr2s"" 2-channel stick remote control. The lighter and slimmer design ensures that your hands won't get tired even on longer trips. In addition, the 6v (4* aa) operating voltage reduces the functional weight by 40%! Equipped with the following standard functions: servo reverse (the direction of rotation/switching of the individual channels can be changed using this function) trim-function for throttle and steering (setting the throttle neutral position and straight-ahead running) st. D/r function for setting the servo travel limit (steering servo only) there are also channels 3 & 4 for free assignment, which can be operated via 2 toggle switches. Radio specification: 4 channel frequency: 2. 4ghz protocol: afhds 2a operating voltage: 6v dc (4* 1. 5v aa mignon) low v alarm: below 4. 2v temperature: 0°c - +60°c weight: 320g dimensions: 190*174*89mm receiver specification: 2020012 - 4 channel mini receiver frequency: 2. 4ghz protocol: afhds 2a waterproof: yes operating voltage: 4. 8v-7. 4v dimmensions: 35x30x13mm weight: 15g aerial length: 260mm scope of delivery: sr4s radio r4wp receiver bind plug aerial tube manual (ab2000022)