USB rechargeable double-sided collarReminder: It can be used f about 1-3 hours after charging f 30 minutes (It is recommended to charge after the battery is used up Do not charge f too long )Product name: Leopard print rechargeable luminous collarMaterial: Polyester webbing, fish-mesh transparent surface, light-guiding flat optical fiber (length can be freely cut)Col: red, blue, yellow, green, ange, colful, white, pink Flashing mode: long on, fast flashing, slow flashing (controlled by switch)Battery life: 30-40 hours, about 2 months of nmal use; the battery can be replaced by yourself, is available in convenience stes supermarkets Cleaning the detachable electronic part This product is suitable f walking the dog in the dark environment at night, outdo pet spts It emits light through optical fiber acts as a warning It can be used f pets during the day night when the light-emitting function is turned on off specification:Size S: Suitable f neck circumference of 34-41cm, width of 2 5cm, total length of 44cm, using 2 CR2032 batteriesSize M: Suitable f neck circumference 37-46cm, width 2 5cm, total length 50cm, use 2 CR2032 batteriesL size: Suitable f neck circumference 41-52cm, width 2 5cm, total length 56cm, using 2 CR2032 batteriesXL size: suitable f neck circumference 42-56cm, width 2 5cm, total length 60cm, use 2 CR2032 batteries[Reminder] Choose the size based on the actual neck circumference of your dog Between different cols: yellow ange have high brightness[Function introduction]: Each model has a hidden switch with 4 functions: fast flashing, slow flashing, static flashing, off It comes with a button battery (remember to remove the collar when taking a bath pull out the battery box directly) The button battery is very convenient to buy in the supermarket