Features: Enhances your radio reception with the 300MHz DonutAM MW/SW Mini Loop Antenna Replacement. The highimpedance amplifier is designed to convert high impedance into a standard 50ohm output, ensuring impedancematching and isolation. Suitable for various antenna likedonut whip antenna, and magnetic rod antenna, it greatly improves reception performances. for radio enthusiasts, broadcast professionals, and wireless communication enthusiasts, the high impedance amplifier is a must have accessory for any radio receiver, SDR, or walkietalkie. The high impedance amplifier provides reliable signal amplification for passive antenna reception. Perfect for use with donutantenna, magnetic rod antenna, and more. Experience clear audioand improved signal strength with the high impedance amplifier. Boost your radio reception and enjoy a wide frequencies with this compact and durable aluminum alloy device. Specifications: Input : 1MΩ Output: 50Ω Gain: 0dB Bandwidth: 300MHz Charging voltage: 5V Internal battery capacity: 800mAH Charging current: 600mA Working hours: more than 24hours Size appprox 49x45x19mm/1.8x1.9x0.7in Package Includes: Package 1 1PC High Resistance Amplifier Package 2 1PC High Resistance Amplifier 1PC DonutSW Antenna 1PC DonutMW Antenna note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!