The moon ring rear light is a great safety light keeping you visible to other road users that are approaching you from behind the ring has a bright circular red cob led which works wonders when its in its flashing modes the light comes with plenty of features that help save its battery life the cnc machined aluminium body has heat sink casing which allows heat to escape from the light quicker than normal therefore conserving wasted energy on overheating coming with 6 modes you are bale to