wireless microphone, karaoke mic, fduce uhf dual handheld dynamic system with rechargeable receiver for party, church, meeting, wedding, 260ft (grey and gold) fduce <p><b>system parameters:</b></p> <p><b>handheld microphone</b></p> <ul> <li> channel: 40</li> <li> capsule: cardioid</li> <li> oscillation mode: dsp chip frequency locking</li> <li> frequency stability:±10ppm</li> <li> rf output power: 10mw</li> <li> working range:80m</li> <li> frequency res.: 40-18000 hz</li> <li> distortion: ≤0.5%</li> <li> battery type: 2 aa</li> </ul> <p><b>receiver</b></p> <ul> <li> channel: 40</li> <li> oscillation mode: dsp chip frequency fixed</li> <li> rate stability: ±10 ppm</li> <li> receive sensitivity: -95 ~ -71 dbm </li> <li> frequency res.: 40-18000 hz </li> <li> distortion: ≤0.5% </li> <li> s n ratio: ≥90 db</li> <li> battery: built-in lithium battery, rechargeable</li> </ul>