The Electro-Voice RE3-BPKRSB-5L is a UHF wireless bodypack system designed specifically for sports officiating and use with the Electro-Voice RSB-2 Referee Switch Box. The set includes an RE3-BPTRSB bodypack transmitter, modified to work exclusively with the RSB-2 referee switch, and an RE3-RX diversity receiver. The transmitter features a durable metal housing and a compact design that can be easily worn and concealed during sporting events. The system can be completed with a compatible Electro-Voice lavalier or headworn microphone and the RSB-2 referee switch, sold separately. Operating in the 488–524 MHz frequency band, it offers 1,440 selectable frequencies across a 36 MHz tuning bandwidth and selectable transmitter output power of 10 or 50 mW. Frequency scanning and ultrasonic sync help simplify setup and wireless frequency selection.