PawCare Illuminated LED Rechargeable Safety Collar, Blue The lighted safety collar creates high visibility for dark walks. LED lights create increased exposure at night that will ensure your dogs protection by keeping them safe USB Rechargable LED's last last up to 5 hours on a 1 hour charge. Never pay for batteries again. Easily recharge by connecting to USB port on any device. Waterproof protection for all weather conditions to ensure proper functioning of device. Multiple lighting settings create additional awareness around your dog. Light modes include solid, blink, and rapid bllink. Easily adjustable collar for large dogs with neck sizes from 15" to 23" around.