Keep playing with your dog even after the sun has gone down with the duvoplus LED Flash Ball. This hard-wearing silicone ball lights up automatically when your dog touches it and switches itself off after 30 seconds to save energy. The light-up ball is an exciting challenge for your dog as well as offering many hours of fun. Use a coin to twist the top open in order to activate the ball or to charge the ball using the USB port. The ball will light up for seven hours! USB rechargeable , no batteries are required.