Tuneable Dual UHF Handheld Microphone SystemTuneable Dual UHF Handheld Microphone System 171. 970 RU210 H Tuneable Dual UHF Handheld Microphone System Dual channel PLL tuneable UHF wireless system with 2 handheld transmitters. The receiver unit is compatible with standard 19" racks using the included rack ears and front mounting antenna accessories. The RF carrier frequency is selected on the receiver and synchronized to the transmitter via infra red at the touch of a button. Up to 2 RU210