Features: <br> <br>One end is connected to the instrument audio port, the other end is connected to the sound system, transmitting audio signals wirelessly. <br>Equipped with USB charging cable, two Micro USB plugs, transmitter and receiver can be charged at the same time. <br>There are four channels, up to four systems can be used simultaneously, the signals won't interfere with each other. <br>Indicator light of transmitter: At boot, the indicator light will indicate the channel number according to the corresponding flashing times of channel. Later, the red light keeps on, with being in transmitting state. <br>Indicator light of receiver: At boot, the indicator light will indicate the channel number according to the corresponding flashingtimes of channel. <br> <br>Specifications: <br>Condition: Brand New <br>Material: Plastic + Metal <br>Color: Black <br>Channel: 4 <br>Frequency Response: UHF <br>System Frequency Response: 20Hz~20KHz <br>Frequency: 730 MHz <br>Max. Transmission Distortion: <50m(no obstacle) <br>Latency: <4ms <br>Power Supply: 3.7V/600mAH Built-in Li-battery & USB Cable <br>Charging Time: <2 hours <br>Work Hour: 4~6 Hours(full recharged) <br>Size: Approx. 11 * 4.3 * 1.7cm / 4.30 * 1.68 * 0.66in <br>Weight: Approx. 269 g <br> <br>Package List: <br>1 * Transmitter <br>1 * Receiver <br>1 * USB Charging Cable <br>1 * Manual <br> <br>Note: <br> <br>Due to different production batches, the power switch has two modes (push up / push down to open). <br>1、One end is connected to the instrument audio port, the other end is connected to the sound system, transmitting audio signals wirelessly. <br>2、Equipped with USB charging cable, two Micro USB plugs, transmitter and receiver can be charged at the same time. <br>3、There are four channels, up to four systems can be used simultaneously, the signals won't interfere with each other. <br>4、Indicator light of transmitter: At boot, the indicator light will indicate the channel number according to the corresponding flashing times of channel. Later, the red light keeps on, with being in transmitting state. <br>5、Indicator light of receiver: At boot, the indicator light will indicate the channel number according to the corresponding flashingtimes of channel.