This unique Radio Frequency Event Bracelet features special technology that lets the wearer sync up LED flashes with the music being played at your event for hours of fabulous fun. Perfect as an admission ticket to Prom, your Homecoming dance, concerts, and other school events, the white flexible silicone wristband can be used with or without a controller (not included; sold separately). Without the controller, the bracelet lights up with red, blue, and green LEDs. With the controller, you can select single color lights and program the bracelet to change colors and flash in time to music for a cool concert effect. Your custom one-color imprint will be featured on the front of the bracelet. Controller is sold separately.