8879 Speed Controll IR Remote Control: This Speed Remote Control can control suitable for Power Functions motor speed. This Speed Remote Control control can control up to 8 motor parts. Features 4 RC channels, 2 stop button and 2 direction control switches. Use the Remote Control to control your motor speed. Requires 3 AAA (1.5v) batteries, not included. 8884 IR Receiver: 2 terminal small receiving main control (2 motor output)2 terminal small receiving main control (2 motor output). Power function IR RC system runs on 4 different channels, allowing you to control 4 different models at the same time. The infrared receiver has 2 outputs, can connect up to 2 different power functions. The reach of the infrared remote control system is at least 10m. Material:plastic colour:As Shown Package Contents: 1 x IR Speed Controll Remote Control 8879 1 x Receiver 8884 Only the above package content, other products are not included. Note: Light 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.