Feature: 1. Safety protection, no matter where the throttle is, the motor will not rotateS when connected to the battery. 2. The throttle range can be calibrated to be compatible with different transmitters. User programmable. 3. Compatible with lithium and nickel metal hydride batteries, wonderful accessory. 4. Support a variety of program methods: emitting rod, LED program card. Very easy to operate at home or on the fly. 5. You can change the time to suit different brushless motors. Full protection: low voltage cut off protection / overheat protection / throttle signal loss protection. Specification: Condition: 100% Brand New Item Type: ESC Material: Electronic Components Color: Black Types: Long, short Current: 40A Output Capacity: Continuous current 40A, short current 55A (not less than 10 seconds) Power Input: 2-4 lithium batteries (not included) BEC Output: 5V@3A (Linear voltage regulator mode - linear mode) Maximum Speed: 210,000 RPM for 2-pole motor, 7,000 RPM for 6-pole motor, and 35,000 RPM for 12-pole motor Size: Approx. 230 x 25 x 8mm / 9.1 x 1 x 0.3in. Package List: 1 x ESC