LED Dog Collar - USB Rechargeable - Multiple Sizes & Colors - Improve Dog Visibility and Safety - Charges Via USB - Metal Loop for Leash - Multiple Settings IMPROVED DOG VISIBILITY - our premium LED dog collar provides optimal dog visibility, making your dog easily visible at dusk, dark, and early morning, reducing the risk of potential accidents and improving dog safety. Your dog will be seen at distance by cars, joggers, cyclists, and others; making the LED + USB Rechargeable Dog Collar the most effective dog safety collar currently available. USB RECHARGEABLE - premium USB rechargeable Lithium-ION battery provides excellent battery life performance, meaning your dog stays illuminated & safe for longer & it recharges quickly too via USB - just like your smartphone! PREMIUM QUALITY + DESIGN - fully adjustable, easy to put on & use, comfy, one click mode selection (always on, rapid flash, slow flash), with a quick-release buckle, a protected USB charging port which is not exposed to dirt & mud, an enclosed battery case & switch for added protection & a better look, & super-strong 100% nylon webbing with high-tensile stitching for maximum strength & dog security. WEATHERPROOF - good for all weather conditions, the collar is water-repellent, it has rust-proof components, & it is lightweight, strong, durable & built to last with only the best top quality materials & components. Small - 11-15 inches Medium 15-18.5 inches Large 18.5-23 inches