For Transmitter CT-8B 2.4GHz Radio System Remote Controller The road distance of the remote control is about 300 meters. When testing, the distance between the remote control and the receiver should be 50 centimeters to avoid signal blockage. This remote control requires the use of 18650 tip batteries.(The product does not come with batteries, which need to be purchased separately) Item Name: CT-8B Transmitter Model Type: Car/Boat/Tank RF Range: 2.4Ghz ISM RF power: Less than 100mW Modulation: GFSK Spread spectrum: FHSS Reaction speed: PWM:20ms RF Distance: Ground 300M Receive sensitivity: Less than -96dbm Transmitter voltage: DC 3.5V-9V Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Black Material:ABS Specification: B: Metal hand wheel version Package Contents: 1 x Transmitter 1 x Receiver 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.