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. Perfect for multi-room venues, weddings, mobile DJ's, 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: power: 10dBm 6:Frequency Response:40~18000Hz 7:Total Harmonic Distortion: 0.5% 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 Distortion :0.5% Material: Plastic colour: Black Package Contents: 1 x TRANSMITTER 1 x Receiver 1 set x parts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.