Output frequency: frequency adjustable, working range 76-108MHz, 1MHz or 0.1MHz in steps, a total of 320 transmission frequencies, with memory function. Output power: 10-500mW (0.01-0.5W) @ 88-108MHz. Receiving device: A regular radio that can receive FM broadcasts can effectively receive the signals emitted by this transmitter. Display : LCD display, displaying the current transmission frequency. FM transmission antenna production data is included, and it has been tested that this transmitter can reach a distance of 2000 meters in open areas. Power supply voltage: 5V USB-type-C (power supply and USB type-C power cord need to be provided by oneself) Please note: 1. This is a transmitter, IT not a radio 2. This transmitter cannot be directly inserted into the microphone. 3. The transmitter does not have a battery inside and requires 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. Power supply current:500mA Input signal:audio stereo, 3.5mm interface standard signal-to-noise ratio: 63dB 0.05% Weight:120g (120g) POWER not included Colour:Black Material:Metal Size:8.5x5x2cm Package Contents: 1 * FM Transmitter 1 * Antenna 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.