Feature:1. Impedance Conversion: The device can convert the higher impedance into the standard 50 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 AmplifierMaterial: Aluminum AlloyBattery: 1 x 800mAh Polymer Battery (built in battery)Input Impedance: 1MOutput Impedance: 50Gain: 0dBBandwidth: 300MHzCharging Voltage: 5VCharging Current: 600mAWorking Time: >24 hours.Package List:1 x High Impedance Amplifier1 x Non Slip Pad Sticker