Feature: 1. Heat Dissipation Function: The controller shell is made of high quality aluminum alloy with design. Due to its good heat dissipation function, it can protect the internal circuit and avoid thermal overload. 2. Provide Stable Speed: The brushless motor sine controller can provide stable speed and sensitive braking and direction change control, providing you a good using experience. 3. Waterproof Connectors: Fully waterproof connectors ensure maximum durability in any weather conditions. High performance wires and waterproof interfaces are durable, ensuring low failure rates for long term use. Specification: Item Type: Sine Controller Color: As Picture Shown Material: Aluminum Alloy Weight: Approx. 420g / 14.8oz Controller Box Size: Approx. 125x66x39mm / 4.9x2.6x1.5in Controller Type: Sine Controller Connector Type: Waterproof Connector Maximum Current: 25±1A Rated Voltage: DC 36V / 48V Speed Setting: 1-4.2V Rated Current: 12A Brake Input: Low Level Low Voltage DC 30/40±0.5V Applicable Motor: Usually 750W Motor Controller Wire Color Definition: 1. Black Long Wire: Motor Wire 2. Red and Black Single Big Wire: Power Cord 3. Black Long Wire (Fine Hole): One for Four/One for Five (9 Cores) 4. Black Line and Red Light Line 5. Black Wire and Yellow Power Assist Sensor Wire Package List: 1 x Controller 1 x Manual Note: It needs to be used in conjunction with products that are consistent with the communication protocol. It needs to be used with a sine brushless motor. It is only compatible for KT series instrument products. The motor does not need a brand, and the connector can be used.