Features The high power brushless motor was researched, developed and produced by Kilews, with 2 years warranty. The best choice of industrial assembly tool which can set the maximum torque up to 4.5 N.m, and the repeatable torque accuracy within ±3%. The cordless battery screwdriver has built-in indicating light to indicate the fasten procedure during operation. The green LED will light up and give a short beep for every fastening screw. Conversely, the red LED will light up and give a long beep if the screw is fastened incorrectly or NG. Users can select HI/LO speed via the electrical switch to meet the operation requirement. Excellent ergonomic design, in order to hold the cordless battery screwdriver comfortably. In order to extend battery operating time, the cordless battery screwdriver will turn to sleep mode automatically when it idled over 3 seconds .Sleep mode helps to save power and extend battery life time.