It's the crank motor from Tianjin Motor Company in China. It's also sold under the brand Bewo. It has the advantage that you can use any controller with it with or without a throttle.
Before anything, take your cranks off and check that the shaft fits through the bottom bracket tube and reaches far enough through to get the arrangement on the other end on properly.
Rides well a very smooth power delivery no super human effort required, very pleased as it runs with a very high torque on 48v, the motor is tiny and the separate controller and small simple display are a bonus