1. This Is A Transmitter, Not A Radio 2. This Transmitter Cannot Be Directly Inserted Into The Microphone. 3. There Is No Battery Inside The Transmitter And It Needs To Be Powered By An External Power Supply. 4. This Is A Transmitter And Cannot Be Used To Enhance Radio Signals. If You Want To Enhance The Signal, Please Buy An Outdoor Antenna Or Antenna Amplifier. 5. The Transmitter Socket Buttons And Other Places That Require Repeated Force Have Been Manually Repaired And Welded To Prevent Them From Being Broken Off By Force. Model: Rc-Fmd5w2 Version: V100 Output Frequency: Adjustable Frequency, Working Range 76~108mhz, 1mhz Or 0.1mhz Step, A Total Of 320 Transmit Frequencies, With Memory Function. Output Power: 10~500mw (0.01~0.5w) @88-108mhz. Receiving Equipment: An Ordinary Radio, A Radio That Can Receive Fm Broadcasts Can Well Receive The Signal Emitted By This Transmitter. Display Mode: Lcd Display, The Displayed Content Is The Current Transmitting Frequency, And Comes With Fm Transmitting Antenna Production Data. It Has Been Measured That This Transmitter Can Reach A Distance Of 2000 Meters In An Open Field. Supply Voltage: 5v UsbType-C Supply Current: 500ma Input Signal: Audio Stereo, 3.5mm Interface Standard Signal-To-Noise Ratio: 63db 0.05%Thd Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:ABS Package Contents: 1 x Transmitter 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.