Adopting 2.4G technology, high-definition sound quality without delay External antenna, better transmission effect Automatic connection when powered on Support RCA and 3.5mm interface input Support RCA and 3.5mm interface output This product is a wireless audio transmitter, which adopts 2.4G technology to achieve high-definition sound quality without delay transmission. The transmitter can transmit the 2.0 analog stereo audio signal of RCA and 3.5mm audio interface to the receiver at a distance of 50 meters for listening. Nsendato solves the tediousness of repeatedly switching the audio source or setting the output audio format and the confusion of cable bundling, so it is widely used in audio-visual education, schools, squares, arcades and other places. The receiver can support two-way volume control. Maximum transmission distance: 50M. Frequency: 2400Mhz Transmission Power: 14DB: 67DB Frequency Range: 20HZ-14.5KHZ Maximum Output Level: 1.75Vp-p Color: Black Material: ABS Package Contents: 1xAudio Receiver 1xAudio Transmitter 2xUSB Cable . Note: Light reflection and different displays may cause the color of the item in the image to be slightly different from the actual product. The allowable measurement error is 1-3 cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.