Features 1、GOOD STABILITY: Advanced digital audio signal processing and FM modulation phase locked loop are used to make the sound more real, the performance more stable, there is no frequency offset during long term operation. 2、LCD SCREEN: The frequency modulation transmitter module adopts a LCD digital display screen, which is intuitive and accurate, with low power consumption and low noise interference. 3、RADIO SETTING: The FM transmitter board is equipped with automatic channel search and radio storage functions, with an audio frequency response range of 50Hz to 18KHz, convenient for operation. 4、VOLUME ADJUSTMENT: Built in 30 digit volume adjustment, adopts button operation, and support for serial AT commands, automatic switching of speaker and headphone output. 5、DATA MEMORY: Equipped with automatic power outage data memory function, automatically searching for all frequency band signals with frequency bands and storing memory. 6、NOISE REDUCTION: Can set threshold processing DSP digital noise, automatically mute when there is no signal, away from the annoying noise of traditional FM broadcasting. Specification Item Type: Transmitter Module Material: PCB Output Power: 100mW Audio Frequency Response Range: 50Hz-18KHz Transmission Frequency: Turn off campus radio at 87.0MHz-108.0MHz, and turn on campus radio at 76.0MHz-108.0MHz Frequency Adjustment Step Size: 0.1MHz/time (short button), 1.0MHz/time (long button) Modulation Method: Standard FM frequency modulation Channels: LINE USB channel (stereo), MIC channel (mono) Equivalent Noise: ≥30dB (sound quality close to CD sound quality) Power Supply Voltage: DC 3.0V-5.0V Working Current: 35mA Transmission Antenna: 75cm / 29.5in Whip Antenna Transmission Distance: Connected to standard 75cm whip antenna, adopts for Tecsun radio station, the measuring coverage radius in open areas is 100 meters. (May vary slightly due to different usage environments) Power Supply: The module corresponds to ports - +, and then power (battery) negative and positive terminals. Battery or other power supplies are recommended. You cannot use switching power supplies without filters (such as low-quality switching power supplies such as mobile phone chargers), otherwise the electricity generated by interference will affect the normal operation of the module. The normal operating voltage of the module is 3.0-5.0V, be careful not to exceed the power supply voltage range Button: Volume +/- : Press volume +/-, and press +/- continuously Frequency +/- : Press frequency +/- 0.1MHZ and hold down continuously +/- 1MHZ Mute: Press this key to mute/unmute The antenna ANT port used to connect the FM antenna for better transmission of FM signals, an external whip antenna of 75cm length is recommended and close to the antenna unimpeded USB Audio Connection: If you need this module USB audio broadcast feature, you will need to connect the USB cable to your computer. The USB port is compatible with ordinary mobile phones and can be connected to the phone and computer modules using a USB cable. Since the PC has a USB 5V output, you can connect the PC directly to the USB port, which power the module. After connecting the computer USB, the module will automatically enter the PC audio playback mode, the LCD screen will display PC, the computer will automatically install the driver end, and the module will be named CD002 sound card device, set the built in computer voice, enabled enable CD002 audio device, the computer system through this module audio, FM transmission mode, LINE Audio Connection: If you need this module LINE (LINE input) channel as the source transmitter, just plug the audio cable into this module, 3.5mm audio jack, and plug the other end into the audio device (such as mobile phone headphone) hole) can, and the module automatically switches to the LINE channel FM transmitter as the source. As long as you adjust to the nearby FM radio transmission frequency and the module's consistency, you can hear the audio coming from the phone side FM Wireless Microphone: If you need this module as a source to transmit MIC, LINE just unplug the cable and USB cable (that is, there is no LINE and USB connection), the module automatically uses the MIC FM channel as the transmitting source, this module has a very high sensitivity body microphone, wireless microphone can be applied according to needs, mother and child storage. Note that use this module transmitter to pick up the effect when adjusting the volume Package List 1 x Transmitter Module