A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. Small DC motors such as this are used in tools, toys, and appliances.
This motor is a very small device and is only able to turn small loads. For example at the given loaded current of 450mA at 5000rpm anything under ten grams can be rotated at a maximum raduis of 1cm. If we increase that raduis distance with ten grams or increase the weight then the motor will stall.