The C4 Band is CrowdSync's most versatile LED wristband, built for concerts, festivals, sporting events and brand activations. Two super-bright RGB LEDs sync across the whole venue for color washes, fades and effects timed to music, video or gameplay. The cloth strap carries your event, team or sponsor artwork, the battery runs 10 to 12 hours, and one control platform handles everything from a few hundred guests to a full arena.