Fangrui Product Details Features: 1. Adds Wireless Audio Connectivity To Any Active Loudspeaker 2. Connect Your Audio Source To The Transmitter And It Sends The Signal To Your Receivers 3. No Compromise In Audio Quality; 4. For Multi-room Venues, Weddings, Mobile Djs, Tricky Floor Monitor Placement And Mobile A/v Matters Needing Attention: Ultra-high Frequency, No Delay; Mono, With A Focus On Midrange Sound; Listening To Music Is Not A Suitable Purpose; Transmitter 1:frequency Range: 501-599.5mhz 2:number Of Channel: 16(1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,0) 3:oscillation Mode: Chip Frequency Locking 4:frequency Stability:10ppm 5:rf Power: 10dbm 6:frequency Response:40~18000hz 7:total Harmonic Distortion: . 8:power Supply: Built In Lithium Battery,600mah/3.7v Receiver 1:frequency Range :501-599.5mhz 2:number Of Channel: 16(1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,0) 3:oscillation Mode: Chip Frequency Locking 4:frequency Stability: 10ppm 5:receiving Sensitivity: -95~-71dbm 6:frequency Response :40~18000hz 7:total Harmonic Distor