Feature: 1. DSP+PLL technology makes the frequency more stable, and the frequency does not drift with the environment changes. 2. The maximum power can be adjusted continuously between 0.1W and 7W to better meet your needs. 3. The power output network suppresses harmonics very well, makes the output spectrum cleaner. Without any adjustment, and brings DIY fun to beginners. 4. The audio input uses a digital potentiometer to adjust the volume. Has a microphone input interface and can control the microphone volume through the digital potentiometer. 5. Set the power-down frequency and volume protection, you don't need to set it again next time you turn it on, which brings you more convenience. Specification: Condition: 100% Brand NewItem Type: 7W Stereo PLL FM TransmitterMaterial: PCBColor: As the Picture Shown.Input Voltage: DC12V Input Current: 3.0A Audio Signal: The Maximum Input Vpp is Less Than 1V. Microphone Type: Cylindrical Microphone Output Power: 0.5W-7W Continuously Adjustable Output Impedance: 50Ω Working Frequency: 76m-108mhz Frequency: 0.1MHz Distortion Degree: 0.03%-0.1% Fireproof Board Size: Approx. 100 x 60mm/3.9 x 2.4in (Without Fins) Control Panel Size: Approx. 58 x 36mm/2.3 x 1.4in Launch Distance: More Than Approx. 8km/8749yd (Provided That the Launch is Open) Stereo Separation: Greater Than 63dB Package List: 1 x Circuit Board1 x Radiator1 x Display1 x Cable2 x Pin header6 x Spring3 x Screw3 x Switch1 x Triode1 x Transistor2 x Connector1 x Accessories Note: 1.This transmitter must use a 50 ohm antenna and an antenna with a frequency of about 100 meters. Conductors, rod antennas, 2.4 g antennas, or radio antennas must not be used instead.2.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering