This clever collar light cleverly comes with its own in-built USB charger, so there\'s no danger of losing yet another charger! The tag is nice and deep too at 3cm, so it will still be seen even if you your dog has a big hairy neck and chest. With 3 modes in Bright White LED, Static, Fast Flash, and Slow Flash you have the option of how you\'d like it to look, and changing between modes couldn\'t be simpler, This light is also easy to operate for people with poor dexterity, no teeny buttons and switches, it is operated by a simple twist of a chunky dial. The message tag comes with 7 optional messages :- Nervous Dog, Friendly Dog, If lost call, CAUTION, Training, Deaf Dog, and Do Not Feed, and they simply peel and stick to the front of the light. A 1.5 hour charge will give around 3 hours of constant light, more if used on one of the flash modes! Attach to Collar or HarnessWater Resistant (not for swimming, but fine for rainy weather)3 Light ModesDeep to stand above thick dog hairIncludes 7 Message TagsIn-built USBDiameter 4.5cm x 3cm Deep