This Robot base with double plastic plates not single plates , so you can load it with many boards and sensors as you like ! If you are planning to use this robot base with Arduino Board , it is easy to use Arduino Motor Shield (Find it Here ) 2WD Magician Chassis is a versatile robot platform featuring two gearmotors with 65mm wheels with a rear caster for differential drive. The chassis plates contain numerous cuts and holes for mounting sensors, microcontrollers and other hardware. The space between the plates is ideal for batteries or more components. Specifications: Motors: * Suggested Voltage:4.5V DC (work well from 3-6V) * No load Speed:90±10rpm * No Load Current:190mA(max.250mA) * Torque:800gf.cm min * Stall current approx 1A Wheels: * 65mm diameter, 30mm width * Plastic rims with solid rubber tyres Chassis: * Laser cut acrylic * Metal standoffs * Top and bottom plates are both 110mm long x 174mm wide