This is the Hobby Motor and Encoder Kit from DAGU, an inexpensive and reliable set of add-ons for your next robotic project. Inside this kit are three pairs of items: wheels, gearmotors, and wheel encoders (including everything you need to hook them up). The Hobby Motor and Encoder Kit is perfect for providing beginners with a cheap and easy to use setup or if you just need a few extra parts.
The off set gear motors included with this kit require a voltage of 3-6V with a no load current of 200mA and possess a stall current of 3A@6V (1.5A@3V), a gearbox ratio of 48:1, and a wheel speed of 65RPm at 3V unloaded. Each wheel encoder in this kit requires a supply voltage of 3-24V, a supply current of 4mA, consists of two neodymium 8-pole magnets with rubber hubs, and two hall-effect sensors terminated with 150mm cables and 3-pin female servo headers.
Contents and Images from Sparkfun