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Dagu Rover 5 Tracked Chassis The Rover 5 tracked chassis, made by Dagu Electronics, is a durable robot platform with caterpillar treads that let it drive over many types of surfaces and uneven terrain. All you need to get the chassis moving is a robot controller or motor controller to drive the two built-in DC motors, which powered by the included 6-AA battery holder (AA batteries sold separately). A small Phillips screwdriver and an Allen wrench are included for working with the chassis. The chassis features a rugged white plastic body with room to house the included battery holder and some additional electronics. The two powerful motors with 86.8:1 gearboxes are strong enough to lift the weight of the chassis and allow it to achieve speeds as high as 10 in/s (25 cm/s) A unique feature of this chassis is the ability to adjust its height and, therefore, the clearance under its body by changing the angles at which the gearbox assemblies are ed on the body. Interlocking teeth on the body and the gearboxes hold them in place and allow you to make adjustments in 5° increments by unscrewing a metal bracket inside the chassis, removing a gearbox, and reinserting it at a different angle. The elastic rubber tracks maintain sufficient tension with several different gearbox angles, allowing the chassis height to vary by nearly 1.5" (3.8 cm). Specifications: Durable plastic body 6-AA battery holder included Two brushed DC motors with 210mA free run and 2.4 A stall current at 7.2 V Maximum speed of 10 in/s (25 cm/s) at 7.2 V Ability to scale inclines limited only by friction Height and clearance can be varied by adjusting gearbox angles Dimensions: 9.5 x 9" x 3" (24.5 x 22.5 x 7.5 cm) in default configuration Weight: 1.6 lb (0.72 kg)