You will receive 4 pieces of LED dog collars in blue and are made of quality PVC, serving you for a long time; Brighter light keeps your dog safe in the dark Adjustable size: the total length of the dog collar is approx. 27.5 inches, and you can easily adjust the length to fit the neck size of the dog like Spaniel, Labrador, Hound, German Shepherd, Collie and more 3 lighting modes: there are 12 LED lights in the collars and the lighting modes can be set to flash, slow flash or steady glow, you can choose the flashing mode; flash dog collar allows vehicles to see your dog in the dark, protecting your dog from unexpected conditions during night walking Waterproof and durable: the adjustable range of LED dog collar is approx. 12 to 22 inches, which could fit most dog neck sizes; It is bright and waterproof, and will not affect performance due to bad weather such as rain or snow USB Rechargeable: There is no need to change the collar battery, just connect the mini USB cable we provide to