Features: - brand new and high quality - Made of high quality material, - This product is suitable for 60A brushless electric wrench - Brushless angle grinder drive plate polishing machine total control panel size 5.2*6.2CM - for brushless and non-inductive angle grinder drive control board. - Control board drive voltage: 18V (5 strings of lithium batteries, fully charged 21V), power 300W. - You can use battery packs marked 48V, 68V, 88V, 98V, 128VF or TV which are actually 18V. - Before the test machine, you must connect the wires---fix the motor---install the casing---tighten the screws---make sure the square shaft of the machine head can rotate easily without getting stuck---connect the power---press the speed control Switch so there are no gaps in the case! Otherwise, there may be a beeping alarm! - To prevent damage to the motherboard, please operate as required. Specification: - Name: electric wrench motherboard - Power supply voltage: 20V - Models: 4 wires-no speed adjustment, 7 wires-no speed adjustment, 4 wires-adjustable speed, 7 wires-speed adjustment (optional) - Angle grinder model: other - Weight: 20g - Power cord length: 10cm - Rated voltage range: single-phase electricity 220V Package includes: 1* Electric wrench motherboard (optional) Notes: 1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the website picture. 2. Please allow a slight deviation between the data and the manual measurement.