Features: 1. Aluminum alloy metal shell, good heat dissipation 2. The transmission frequency can be set within the range of 87-108MHz 4. Channel switching: stereo switching, mono switching 5. High fidelity Bluetooth: You can connect wirelessly to your phone, tablet, and other Bluetooth devices as audio input 7. Good heat dissipation: High quality double ball fan is used, with reasonable heat dissipation channels and good heat dissipation performance 8. Standing wave protection: When the antenna is not connected or damaged, it automatically enters the protection state 9. Temperature protection: When the internal temperature of the machine is too high, it automatically enters the protection state 10. 1/4 wavelength strong magnetic suction cup antenna, which can be tightly attached to the roof or any metal flat object, making it easy to move the antenna to the outside of the roof, balcony or window, and more effectively emitting and receiving electromagnetic waves Specifications: &&&&&&&&& Frequency range FM: 87-108MHz Frequency step 100Khz Frequency stability ± 10ppm Frequency stabilization mode PLL Harmonic and noise radiation ≤ 50dB Output impedance 50 Ω Pre weighted 75us Audio distortion of 0.3% Bluetooth distance is about 5m Frequency response 50Hz? 9? 115000Hz Separation degree ≥ 30dB Frequency modulation ± 75KHZ Signal to noise ratio ≥ 60DB Antenna connector type TNC Working temperature -10 & 8451;? 9? 145& 8451; Transmitter size 144 x 100 x 59mm Transmitter weight 545 grams antenna Connector type TNC Gain 2.15dB Impedance 50 Ω Minimum shrinkage length 210mm (0.69 ft) Paper feeder length 5m (16.4 ft) source Input voltage of 100? 9? 1240V 50 / 60Hz Output power DC 12V 3A Usage scenario: