Bulk stock new N20 miniature gear motor, with plastic housing seal, output shaft silicone sealing sleeve, originally used in the lock, rated voltage 3V, measured 3-5V can run.
The measured 3V and 5V voltage and speed of the motor are as follows:
Voltage 3V, no-load current 40ma, no-load speed 40 rpm.
Voltage 5V, no-load current 45ma, no-load speed 68 rpm.
The geared motor weighs about 16g, and the price is the price of one motor.