Redcat 28451 R3C 4-Channel Transmitter & R3C-ER 2-in-1 ESC/Receiver Unit The Redcat R3C Four-Channel Transmitter and R3C-ER Two-in-One ESC and Receiver Unit is a high-quality replacement combo designed for the Redcat Ascent-18 platforms. This combo includes a four-channel R3C transmitter paired with a three-channel ESC and receiver unit, simplifying your electronics setup by combining key components into a compact and efficient package. This system is engineered for dependable signal strength, smooth throttle response, and precise control, making it a great choice for mini crawler owners seeking straightforward installation and performance. SPECIFICATIONS: Transmitter Application: Surface Band: 2.4GHz Protocol: 2A-BS Channels: 4 Input Voltage: 1.5V AA Batteries (4) Range: 984.25ft (300m) Dimensions: 6.30x7.60x3.82in (160x193x97mm) Weight: 7.76oz (220g) Receiver Application: 1/18 Crawler Channels: 3 Band: 2.4GHz Protocol: 2A-BS Dimensions: 1.50x0.98x0.51in (38x25x13mm) Range: 984.25ft (300m) Input Voltage: 2S LiPo (7.4V) Connector Type: JST Weight: 0.35oz (9.8g) INCLUDES: (1) 4-Channel R3C Transmitter (1) 3-Channel R3C-ER 2-in-1 ESC/Receiver Unit Product Manual Needed to complete: (4) AA Batteries