A hand-held controller for a virtual-reality system includes an antenna, a grip, a cage coupled to the grip, and a plurality of LEDs on an outer surface of the cage. Wireless signals are received from a remote camera via the antenna. The plurality of LEDs is duty-cycled, which includes turning on the plurality of LEDs at times determined using the wireless signals. The times when the plurality of LEDs is turned on correspond to times when the remote camera captures images of the hand-held controller.