Safe and visible. The LED collar is suitable for use in dark environments or at night. You can find your pet dog easier when training it at night. And it can also protect your pet dog from any car accidents at night. Comfortable and adjustable. Made of sturdy and durable material, it will be comfortable to wear for your pet dog. You can adjusted the size of the necklace freely.P ower by battery. Built-in power storage device, and it will last for 30-40 hours. Battery is included, it can be used for about 2months, and can be replaced when it is no power. User-friendly. There are 3 lighting mode, included long light, fast flashing and slow flashing. It is controlled by the switch. Waterproof. It is Rain resistant, washable and durable. You can choose the suitable color and size for your pet dog.