Features: 1. Small Size And Easy To Carry2. Strong Receiving Ability3. Match With Different Feeder Connectors4. Can Be Used With A Variety Of Receiving Devices5. 360-Degree Rotatable Ring, Indoor Portable Antenna Description: 1. Receiving Frequency: SW2.30-30Mhz (Main Adaptation Frequency)2. MW522-1710Khz (The Matching Radio Must Have Medium Wave Input)3. Impedance: 50 OHM4. Gain: 20DBI5. Power Supply: Built-In 18350 Lithium Battery, Standard Type-C Charging PortNote: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The UseSize: Ring Diameter 20cm, Antenna Box 10.5 x 6.5 x 2.6cmMaterial: ABScolour: As Shown Package Contents: 1 x Antenna Control Box1 x Ring2 x Feeder1 x Power Cord Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.