391:1 Metal Gearmotor 20Dx46L mm 6V with Extended Motor Shaft Shipping:2-4 Weeks It can be configurated by

It can be configurated by AT command and you can also update its firmware by USB

Red indicates power

so if you have a RAM-intensive application you may need to stick with the B+

They are grouped on both sides near the USB connector

and can be used in many display applications: waveform monitor display

391:1 Metal Gearmotor 20Dx46L mm 6V with Extended Motor Shaft Shipping:2-4 Weeks It can be configurated byThese small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 390. 6: 1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 2 mm extended motor shaft . Key specs at 6 V: 36 RPM and 170 mA with no load, 260 oz in (19 kg cm) and 2. 9