Pet Dog Puppy Anti-lost USB Rechargeable Flashing LED Light Collar Necklace. Specifications: The product is suitable for pets to walk at night, play a role of safety warning. The length can be cut a part, you can adjust the size. The visibility of LED lights can reach 500 meters when the power is sufficient. Item Name: Dog Collar Material: Nylon Battery: 1 x 3.6V 35mAh LIR 2030 Battery (Included) Features: Anti-lost, Rechargeable, Adjustable XS Size: Width: 2.0cm/0.79", Minimum Length: 32cm/12.6", Maximum Length: 40cm/15.75", Telescopic Range: 8cm/3.15" (Approx.) S Size: Width: 2.5cm/0.98", Minimum Length: 35cm/13.78", Maximum Length: 43cm/16.93", Telescopic Range: 8cm/3.15" (Approx.) M Size: Width: 2.5cm/0.98", Minimum Length: 40cm/15.75", Maximum Length: 48m/18.9", Telescopic Range: 8cm/3.15" (Approx.) L Size: Width: 2.5cm/0.98", Minimum Length: 45cm/17.72", Maximum Length: 52cm/20.47", Telescopic Range: 8cm/3.15" (Approx.) XL Size: Width: 2.5cm/0.98", Minimum Length: 52cm/20.47", Maximum Length: 60cm/23.62", Telescopic Range: 8cm/3.15" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Dog Collar 1 x USB Cable