Operating Voltage: 6.0 ~ 8.4 DC Volts Weight: 47/49 g (1.66/1.73 oz) Bearing Type: Ball Bearing x 2 Motor Type: 4-Pole Brushless Motor Gear Type: Titanium + 7075+Steel Stall current: 3.6A Operating Temperature: -10℃~60℃ Working frequency: 1520μs / 1666hz Size: 41.0 x 20.0 x 23.6 mm ( 1.61 x 0.79 x 0.93 in)