Flash light band is a smart, illuminating/flashing collar for your dog that increases visibility in the dark.The collar can be easily charged using the included USB cable. Power adapter not included but you can use the same power adapter as you when charging your mobile phone.Facts about Flash Light Band:Can be used in two modes: flashing or solid light.The green version is 18 mm wide.The blue version is 30 mm, suitable for long-haired dogs.Made of silicone.Charged using the USB cable provided.Power adapter not included.Can be shortened to desired length.Splash proof.Flashes approximately 4 hours on one charge.Lights up for about 2.5 hours with solid light.