391:1 Metal Gearmotor 20Dx46L mm 6V with Extended Motor Shaft Shipping:2-4 Weeks They are grouped on both

They are grouped on both sides near the USB connector

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

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

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 They are grouped on bothThese 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