Comprehensive RC Jet Engine Kit: This kit includes everything needed for a thrilling underwater jet boat experience. It features a powerful thrust engine with 4-blade propellers for balanced propulsion High-Efficiency Brushless Motor: Equipped with a 40A electronic speed controller (ESC) that provides smooth and efficient power management to the brushless motor, enhancing the performance and durability of your jet boat With fine workmanship, it has compact structure and long service life. High performance ensures better work efficiency Motor with design provides smooth operation and strong& high speed power. Type: Underwater Thruster Voltage: 12-24V Current: 20A RC Boat Accessory, Powerful, Good Replacement Type: Servo tester Output: 15mA (5.0) Input: DC 4.2-6.0v Output signal: 1.5ms0.5ms 90-degree and 180-degree servos cannot be used Note: The product cannot test servos weighing more than 55g Input: ESC Technical parameters of 40A ESC continuous current:40A instantaneous current:60A Number of lithium battery cells:2-6S Is it programmable:yes BEC type:Switch; 3A/5V Specifications Due to different batches, there may be differences in product appearance and printed text, which not affect use Color: Green Material: Plastic+Metal Package Contents: 1 x Reverse Propeller 1 x Servo 1 x 40A Bidirectional ESC 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.