Features: 1. Small Size And Easy To Carry 2. Strong Receiving Ability 3. Match With Different Feeder Connectors 4. Can Be Used With A Of Receiving Devices 5. 360-Degree Rotatable Ring, Indoor Portable Antenna 1. Receiving Frequency: SW2.30-30Mhz (Main Adaptation Frequency) 2. MW522-1710Khz (The Matching Radio Must Have Medium Wave Input) 3. Impedance: 50 OHM 4. Gain: 20DBI 5. Power Supply: Built-In 18350 Lithium Battery, Standard Type-C Charging Port Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Size: Ring Diameter 20cm, Antenna Box 10.5 x 6.5 x 2.6cm Material: ABS colour: As Shown Package Contents: 1 x Antenna Control Box 1 x Ring 2 x Feeder 1 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.