GH-S37D Miniature Servo Servo Digital 3.7G for Remote Controlled Self-Driving; d boat of the Trex 250 helicopter Weight: 3.7g Dimensions: 20.0x8.75x22.0mm Torque: 0.6 kg/cm (at 3.6V) 0.8 kg/cm (at 4.8V) Speed: 0.13sec/60 deg; (at 3.6V) 0.09sec/60 deg; (at 4.8V) Motor Type: Shallow Cup Working Voltage: 3.6V-4.8V Working Temperature: 0C-60C Standard Signal: 1000-2000 microseconds Working Angle: 90 deg; Current: less than 350mA Dead zone setting: 3 usec Cable length: 150mm Color: blue Material: plastic+metal Package content: 2 x GH-S37D digital servo / 10 x GH-S37D digital servo / 5 x GH-S37D digital servo Only the above package content, other products are not included. Note: Light reflection and roacute; Different displays may cause the color of the item in the picture to be slightly different than it actually is. The allowed measurement error is +/- 1-3cm.