ROCKBROS anti-theft fingerprint security U-lock weighs about 437 grams and is powered by a Lithium battery (4220 mAh).
The U-lock size is 19 x 12 x 3.7 centimeters. Lock hook material is an aluminum alloy and the shell material is made of zinc alloy, ABS, and a silicone exterior.
The lock uses fingerprints to be unlocked, as well as an emergency key lock.
The fingerprint port has a rain cover for added protection and the lock has a USB connection for emergency charging.