Features: - Direction is adjustable. - Auto bounce back function. Built-in sensor can detect when arm hits obstacle. - Intelligent limited sensor. Limited sensor can check open & close position automatically. No need adjusts it by hand. - Position memory function. The motor can remember limited position, so it will move back to right position even we turn motor handle to avoid motor stuck. - Lower working temperature. No thermal protection even we don't add fan to cool motor. - Longer working life. It can open and close 3million times.