About The Product1. The BOYA BY-WM8 Pro is an upgraded, UHF dual-channel wireless microphone System for capturing audio with dual subjects, features an easy-to-read LCD display, a wide switching RF bandwidth, PLL-synthesized tuning and digital companding circuitry.2. The package is suitable for a wide range of wireless applications such as interviews, electronic news gathering (ENG), electronic field productions (EFP), film production, business and educational applications, and more.Feature1. Dual-channel wireless receiver.2. 48 UHF channels.3. Seletable stereo and mono mode.4. Mic and line-in.5. Selectable mute function.6. Easy-to-read LCD displays.7. Automatic LCD-locked function.8. Monitoring sound by headphone output (receiver).9. More than 6 hours continuous operation.10. Operation range can reach up to 100m(300ft) (without obstacle).11. Two AA batteries for both transmitter and receiver.Transmitter1. RF output power: =2. Antenna:1/4 lambda wire antenna3. Spurious emission: 250nW or less4. Audio input connector: 3.5mm jack 5. Reference audio input level: -60 dBV (MIC input, 0 dB attenuation)6. Reference deviation: +/- 5 kHz (-60 dBV, 1 kHz input)7. Input frequency range: 20Hz-20KHz8. Distortion: 0.5% or less9. Power supply: Two AA size batteries (not included)10. Operation time: About 6 hours11. Dimensions: 208(H) x 67(W) x 29(L)mm12. Weight: 80g without batteriesReceiver1. Antenna:1/4 lambda wire antenna2. Audio output connector: 3.5mm jack 3. Signal to noise ratio: 70 dB or more4. Distortion: 0.5% or less5. Headphone output level: 30mW (16 ohm)6. Audio output level: -60 dBV7. Power supply: Two AA size batteries (not included)8. Operation time: About 4 hours9. Dimensions: 208(H) x 67(W) x 29(L)mm10. Weight: 90g without batteriesLavalier Microphone1. Transducer: Back electret condenser2. Polar pattern: Omni-directional3. Frequency range: 35Hz ~ 18 KHz4. Signal / noise: 74dB SPL5. Sensitivity: -30dB +/-3dB / 0dB=1V/Pa, 1 kHz6. Connector: 3.5mm locking mini plug7. Length: 1.2m