The Spotlit Rechargeable Disco Tech Collar Light is easy to use you just need to clip it into your dogs collar or lead and then you are good to go. It features a rechargeable Disc-O Tech module which has a run time of 5 hours and it has four selectable colours, red, green, blue, or white, setting any of them to glow or flash, colour-changing Disc-O mode, and memory feature mode meaning it remembers the last colour setting you had it on. It can be turned on/off using a push button and the body is weather resistant. It can recharge in 2 hours via a micro USB cable which is not included.  The Niteize Spotlit Rechargeable Disco Tech Collar Light features a stainless steel carabiner clip which easily attaches to collars, harnesses, and leashes. Rechargeable Disco Tech Collar Light for dogs  Easily clips onto collars, harnesses, and leashes  Rechargeable Disc-O Tech module with 5-hour runtime  Four selectable colours: red, green, blue, and white. Glow or flash modes, color-changing Disc-O mode, and memory feature  Weather-resistant construction for outdoor use  On/off control with a push button  Stainless steel carabiner clip for secure attachment  Recharges in 2 hours via micro USB (cable not included) _