Keywish Hummer-Bot-2.0 Instruction Manual page 33

You need to remove the rubber ring at the "1" mark to open the caser and solder the wire to +12V and GND,
as shown in Figure 3.1.31.
Figure 3.1.30 Shematic diagram of solder DC power supply head
Figure 3.1.31 Effect diagram of solder DC power supply head
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