It's have 8 kinds of colours (red blue orange yellow green pink purple white). No need batteries,and can be recharged by means of the USB cable with any other daily use device,e.g. computer that has USB port. Glowing time:about 3 hours. Charging time : half of time. Glowing model: continue glowing, slowly glowing, quickly glowing control by switch. We use the soft rubber to make dog collar.It is a high quality collar. Make sure your pet is comfortable.