Kailian USB Rechargeable & Solar charger LED Dog Collar Reflective Flashing Lights LED Waterproof Dog Collar L: Width 2.5cm (~1 "),length 50~60cm (19.5"-23.6"),5cm could adjustable,Recommend weight 60lb-80lb. It is great gift for your pet on Halloween, Christmas. Keep safe for your baby when the dog walking at night Flash modes:(Push the button on with 3 different light settings: Flashing, non-flashing, and off ) Waterproof 30 minutes in rainning,could fit for small medium and langer dog/pets. Keep safe for your baby when the dog walking at night