Feature: 1. Impedance Conversion: The device can convert the higher impedance into the standard 50Ω output impedance, playing the role of impedance matching and isolation. 2. Applicable Antenna: Mainly used for passive antenna receiving matching, suitable for resonant antenna, tie rod antenna, whip antenna, magnetic bar antenna, etc. 3. Compatible Devices: This high impedance amplifier can be used for any receiver, radio, intercom, etc., compatible with more models, convenient and practical. 4. Good Performance: Obtain energy from the input antenna, reduce signal energy loss caused by unstable input impedance, improve reception performance. 5. With 800mAh Battery: This high impedance amplifier has a built in 800mAh polymer battery, ensuring long term endurance, and can be used anytime, anywhere. Specification: Item Type: High Impedance Amplifier Material: Aluminum Alloy Battery: 1 x 800mAh Polymer Battery (built in battery) Input Impedance: 1MΩ Output Impedance: 50Ω Gain: 0dB Bandwidth: 300MHz Charging Voltage: 5V Charging Current: 600mA Working Time: >24 hours. Package List: 1 x High Impedance Amplifier1 x Non Slip Pad Sticker