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 Technical specifications: 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:less than equal 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:less than equal 0.5% Color:Black Material:ABS Package Contents: 1 * transmitter 2 * receiver 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.