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/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: 1 x Audio Receiver 1 x Audio Transmitter 2 x USB 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.