ITEM NAME:New 2WD Smart Motor Robot Car Chassis Battery Box Kit Speed Encoder for Ard N2C9 New 2WD Smart Motor Robot Car Chassis Battery Box Kit Speed Encoder for Ard N2C9 Color: As shown Material: plastic Mechanical structure is simple, it is easy to install. This car is the tachometer encoder. Can be used for distance measurement, velocity. Can use with other devices to realize function of tracing, obstacle avoidance, distance testing, speed testing, wireless remote control. For Motor: (Voltage, Current, No-load Speed, Load Speed, Torque, ) DC 3V, 160mA, 120 rpm/min, 100 rpm/min, 0.45 kg.cm; DC 6V, 220mA, 200 rpm/min, 175 rpm/min, 1.0 kg.cm; DC 7.2V, 250mA, 250 rpm/min, 210 rpm/min, 1.5 kg.cm. Reduction Ratio: 1:48 Noise: less than equal 65dB Motor Size: 65mm x 18mm x 22mm(L*W*H) For Smart Car: Voltage: 3~9V Drive Mode: 2WD Current: 600mA Chassis Thickness: 3mm Load: less than equal 2kg Car Weight: 285g Speed: 0.6 m/s Car Size: 220 x 175 x 65mm Package List: 1 x Car Chassis 2 x DC Gear Motor(1:48) 2 x Car Tire 2 x Velocimetry Code Wheel 1 x Universal Wheel 1 x Battery Container(battery is NOT included) 4 x M3*8 Screw 8 x M3 Nut 8 x M3*6 Screw 4 x M3*30 Screw Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm.