Mini 4WD Motor Stand & Battery Box with Alligator Clips This is a power supply that can be used for motor cleaning and checking motor RPM. You can use it immediately with 2 AA batteries. The alligator clip storage lid can be used for removing pinion gears and adjusting offset (adjustment values are approximate). ***Please note the following regarding the battery box:*** The wiring is thin, so do not pull it strongly. This may cause a disconnection. Always remove the batteries when not in use. Do not allow the clips to touch each other while the switch is on. "Mini 4WD Motor Cleaning Jig" 650 yen "Mini 4WD Motor Cleaning Jig Motor Stand & Battery Box Set" 1450 yen Individual items and sets are also available. Shipped via Yu-Packet Post Mini.