Enhance your audio transmission projects with this versatile Audio Transmitter Module, expertly designed to operate within the national standard FM band of 88-108MHz. Featuring an adjustable transmission frequency through a tunable capacitor, this module offers precise frequency tuning to meet your specific requirements. Built on a durable PCB material, it delivers reliable performance across a wide working voltage range of 0.7V to 9V, ensuring strong practicability and adaptability for various sound transmission needs. Key Features: · Wide Frequency Adjustment Range: Supports frequency tuning across 88-108MHz, covering the entire standard FM band for flexible audio transmission applications. · Tunable Capacitor Control: The green tunable capacitor allows easy and accurate frequency adjustments to optimize signal transmission. · Ultra-Wide Operating Voltage: Functions effectively from 0.7V to 9V, accommodating different power supply scenarios while maintaining consistent performance. · Long Transmission Distance: When powered at 9V and using a 70cm wire antenna, it achieves an impressive transmission range of approximately 50-100 meters (164-328 feet) in open areas, depending on the environment. · Broad Compatibility: Can be received by standard FM radios and mobile phones (note: using earphone cables with mobile phones may reduce antenna sensitivity and is not recommended). · Versatile Applications: Ideal for sound transmission pickups, audio microphones, sleep monitoring for elderly and children, and other scenarios requiring clear sound capture and transmission. Specifications: · Item Type: Audio Transmitter Module · Material: PCB · Working Voltage: 0.7V–9V (wide voltage range) · Frequency Adjustment Range: 88–108MHz (adjustable FM band) · Transmission Distance: Approx. 50-100 meters (164-328 feet) at 9V with 70cm antenna wire · Emission Power and Current (selected examples):  - 9V: 24mA, 10.2dBm (approx. 11mW)  - 5V: 14mA, 6.1dBm (approx. 5mW)  - 1.5V: 4.2mA, -4dBm (approx. 0.5mW) Package Includes: · 1 x Audio Transmitter Module This Audio Transmitter Module offers flexible frequency tuning, wide voltage compatibility, and reliable long-distance transmission, making it an essential component for audio transmission and sound monitoring solutions. Its compact PCB design ensures easy integration into your projects, delivering efficient and stable audio signal transmission for professional and hobbyist applications alike.