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. Adjustable squelch eliminates interference 5. Perfect for multi-room venues, weddings, mobile DJ's, tricky floor monitor placement and mobile A/V 6.Matters needing attention: (6.1)Ultra-high frequency, no delay; (6.2)Mono, with a focus on midrange sound; (6.3)Listening to music is not a suitable ; Working Status: (TX) Transmitter introduction 1. Green Light at work. 2.Power is insufficient, not remind, automatic shutdown 3. Charging blue light on, full blue light off 4. TX transmitter out of power after automatic shutdown, when charging will still be in the working state. Please stop charging after 1 minute of charging and turn off the transmitter TX working state before charging, otherwise the battery will not be saturated with charging. We are improving the program, this is not a quality problem, please to use. (RX) Receiver introduction 1. Green Light at work 2. Signal disconnect Red Light 3. The flashing Blue Light indicates a small amount of electricity 4. Charging blue light flashes, The blue light stays on when the battery is fully size: 70 x 26 x 19mm Material: plastic colour: black Package Contents: 1 x transmitter, 1 x receiver, 1 x charging cable, 2 x connecting wires 1 x storage bag Only the above package content, other 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.