AU680 Wireless Audio Audio Transmitter Is A Transmitter That Realizes Wireless Home Audio And Video Entertainment. AU680 Wireless Audio Audio Transmission Box 100 Meters Transmission Distance The Product Consists Of A Transmitter (Transmitter) And A Receiver (Receiver). The Transmitter Can Be Connected To Mobile Phones, Computers, Players, Microphones, And The Receiver Can Be Connected To Speakers And Headphones To Play Audio), The Wireless Distance Is 100 Meters, And Can Pass Through Walls 1. Working Voltage: Transmitter: 3.6-5.5v Dc; Receiver: 3.6-5.5v Dc 2. Working Current: Transmitter: Max250ma; Receiver: Max 100ma 3.Ambient Temperature: Transmitter Receiver: 0-85℃ 4. Actual Operating Frequency Range Of The Module: Transmitter Receiver: 749-770mhz 5. Transmitter Modulation : Pi/4dqps 6.Channel Spacing: Transmitter Receiver: 4mhz 7. Frequency Selection : Transmitter: Provides One-Way Cycle Selection Of Channels; Receiver: Provides Automatic Tracking Search 8. Frequency Stability: Transmitter Receiver: ±100khz 9. The Actual Working Channel Of The Module: Transmitter Receiver: 20ch 10.Module Channel Spacing: Transmitter Receiver: 1mhz 11. Transmitting And Receiving Distance: 100 Meters (In An Open Place, The Test Uses A Transmitting Power Of 100mv) 12. Transmit Power: 1-100mv (Default Is 100mv) 13. Receiver Sensitivity: -95dbm 14. Transmitter Input Level: Max 1.0vpk 15. Transmitter Input Impedance: 10k Ohm 16. The Transmitter Has Three Input Modes: Stereo Audio Input; Ordinary Microphone Input; Monitor Pickup Input 17.Colour:As Shown 18.Material:Metal Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Package Contents: 1 x Transmitter 1 x Receiver 1 x Audio Cable 1 x Chinese And English Manual 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.