Features: High visibility ,keep your dog safe in the dark. Three modes, which can be switched with one button, fast flashing, slow flashing and stable lighting. Make your pet activities more eye-catching, prevent loss, avoid traffic accidents, and do not frighten pedestrians. The size can be adjusted. Soft and comfortable without restricting the dog neck. The glowing dog collar will keep your dog away from some potential dangers. Package Includes: 1x LED Dog Collar Specifications: Material: PVC SizeS: Approx.35cm/13.78inch SizeM: Approx.50cm/19.69inch Color: Multi-color, Red, Pink, Blue, Green, Yellow, Orange, White(optional) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.