Nite Ize offers the SpotLit Rechargeable Disc-O Tech Collar Light. The rechargeable light provides clip-on simplicity with micro-USB rechargeability and new LED technology. Its integrated Disc-O Tech module features color-changing Disc-O mode, a built-in memory feature and four selectable colors of red, green, blue and white, each with glow and flash modes. Set in a stainless steel carabiner clip that attaches to any collar, key chain or bag, it has a run time of five hours and recharge time of two hours.