Feature: 1. Backround music can be input throuh or line‑in, adjust the volume throuh the knob, switch function. 2. The volume and reverberation of the rophone can be adjusted by the knob. 3. The rophone adopts UHF band, and its workin distance is above 25 meters/82ft. 4. rophone and receivin box are made of aluminum alloy technoloy, which is not easy to damae and is hih‑end and luxurious. 5. Support frequency conversion operation of professional rophone, rophone supports 25 channels to avoid interference sinals anytime and anywhere. 6. Supported Priority function, hih sensitivity, when someone is speakin, the backround music will automatically lower by half to hihliht the human voice, when no human voice, the backround music will return to normal. 7. Accurate pickin and can perfectly reduce the noise brouht by the environment, easy to show the voice. Specification: Item Type: Receiver Wireless rophone Material: ABS+Aluminium Alloy Color: As Pictures Shown Weiht: Approx. 1188/41.9oz Product model: K28 SNR: &t;70dB Transmission power: < 10mW Distortion: < 0.5% Output amplitude: 500mV Spectrum: UHF Sinle rophone power supply battery: 2 AA(not includin) Sinal receivin power box: 5V/1A adapter or portable battery Use distance: indoor 40 meters/131.2ft, outdoor 25 meters/82ft Applicable scope: family entertainment, concert, senior conference, and teachin host n, outdoor mobile KTV, etc Operation steps: 1. cable, plu cable and power cable are connected to the receivin box 2. rophone with battery 3. Turn on the rophone power switch Packae List: 1 x olden rophone (battery not includin) 1 x Silver rophone (battery not includin) 1 x Receiver Box 2 x D3.5 Cable 1 x D3.5 Female Head to for Plu Cable 1 x USB Male Head to DC Head Power Cable 1 x Manual 2 x Anti-skid Cover