Choosing Our Led Dog Collar, More You Will Get: 1&Nbspsuper Light Give Your Dog Safety In The Dark From All Angel 2&Nbspmulti-Colors And Multi-Size, You Can Select Your Favorite Color For Your Dogs 3&Nbspadjustable Collar, You Can Set The Best Size For Your Dog, And Your Dog Will Wear It More Comfortable 4&Nbspnice Service, Order Our Led Dog Leash With 30-Day Money Back If You Have Any Questions About Using Or Others Issue, Please Contact Us Any Time, We Will Reply You Asap, Buy It Now Led Collar Length (Can Be Adjusted By Pulling The Led Fibers Through The Adjustment Buckle): X-Small: Min 9A And Max 137A 23-35 Cm Small: Min 11A And Max 157A 28-40 Cm Medium: Min 15A And Max 197A 38-50 Cm Large: Min 19A And Max 236A 48-60 Cm X-Large: Min 216 And Max 275 55-70 Cm Dog Collar Width: Xs-Xl Collar Width Is 1 Inch (25 Cm) Full Charge Time: 2 Hours Running Time: 10-16 Hours