Like the clear acylic keyrings, the distinguishing feature of these keyrings is their ability to glow in the dark. Once charged, they glow in the dark for approximately 10 hours. Apart from the novelty value, these keyrings can be quite useful. When fully charged they can be used to help to locate the door handle or lock on a car, locate the keys in the handbag. To be recharged, they need to been held near a light source for around 2 minutes.