Abstract: A wristband (12) includes an RF receiver (34) arranged to receive targeted data burst (38). A controller (28) interprets the data bursts (38) to recover embedded activation codes that control operation of either individual wristbands (12) or a selected group of similar wristbands (12) worn by members of an audience at a venue (100) or event, such as a gig. Each wristband further includes at least one light emitting device (36), such as a high-intensity LED, and preferably multiple LEDs. In the event that a received data burst (38) is resolved to relate to (i.e. is addressed to) the wristband, a recovered activation code from that data burst is cross-referenced against LED control sequences stored in a memory (25) in the wristband (12).