Scope of application: applicable to 1/8 1/10 1/18 1/24 RC Crawler Fine workmanship: fine workmanship, looks very beautiful. Easy to use,Easy to replace Description 1. Function Overview: Four Wheel Steering Controller works with either 2Ch or 3Ch transmitters. Take yourcrawler to the next level of 4 wheel steering without high dollar transmitter upgrades Mode 1. Front Wheel Steering (Rear servo locked) Mode 2. Rear Wheel Steering (Front servo locked) Mode 3. Mode 4. Tank Turn (Opposite Direction) 3. Function switching method: 1. For 3Ch transmitters, flip 3rd channel switch to change the mode, the controller willcycle to the next mode. 2. For 2Ch transmitters, keep the throttle and steel wheel center, and then steer left (orsteer right) three successive times within 1.5s seconds, the controller will cycle to the next (CH2 should work and throttle kept center)Note: CH2 should work and throttle kept center, this prevents accidental switchesduring normaldriving . 4. Wiring instructions: Black: CH1,White: CH2, Red: CH3For 3Ch transmitters, plug in CH1 and CH3For 2Ch transmitters, plug in CH1 and CH2. 5. The remote controller for TRX4M is not supported. A CH2 or CH3 channel remote controller is required. Colour:As Shown Material:Composite Materials Package Contents: 1 x RC Upgrade Parts kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.