This dual-channel UHF wireless vocal system is sold under the SKM 9000 name and is aimed at users who need two wireless handheld microphones running simultaneously for karaoke, live performances, conferences, churches, schools and events. The package includes a dual-channel receiver and two metal handheld microphones, so two presenters or singers can perform at once. Each channel offers selectable UHF frequencies in the 510 to 560 MHz range with automatic frequency scanning to find and lock the best available channel, and the transmitter and receiver synchronize easily for quick setup. Tone Lock squelch circuitry protects against RF interference, while a backlit LCD display shows RF level, AF level, channel frequency and mute status at a glance. Connectivity covers two individual XLR outputs plus one mixed quarter-inch output, with independent volume control per channel, and the receiver is rackmountable in a standard 19-inch rack. Battery life is rated at up to 12 hours on AA batteries with an operating range of up to 150 metres line of sight. Please note: this listing's specifications indicate a third-party manufactured system rather than a genuine Sennheiser DIGITAL 9000 product; the details above come from the seller's own listing. Key Features: - Dual-channel UHF receiver with two metal handheld microphones - UHF operating range 510 - 560 MHz - Automatic frequency scanning and transmitter setup - Backlit LCD showing RF/AF levels and channel frequency - 2 x XLR individual outputs plus 1 x 1/4-inch mixed output - Up to 150 m operating range (line of sight) - Up to 12 hours battery life on AA batteries; 19-inch rackmountable