Features: 10KHz-159MHz Receiving frequency, free of tuning and has strong receiving ability. Built-in a signal amplification circuit and noise suppression circuit, it can effectively amplify the signal and reduce the impact of noise. Designed as a split type, the loop circuit is added to the antenna to effectively introduce the outdoor electromagnetic signal into the room through the feeder. Excellent circuit design, which can fully control the noise interface, improve your using experiences. 26cm Inner diameter antenna ring, compact and portable. Built-in battery for protection circuit to protect the battery from over-discharge and over-charge, automatically disconnect when the battery voltage is lower than 2.5v. Specifications: Material: High-grade Plastic for Shell + Stainless Steel Ring Control Box: Approx. 107x65x26 mm/4.2x2.6x1" Antenna Ring Inner Diameter: Approx. 260 mm/10.2" Output Cable Length: about 1m/3.3ft BNC Cable Length: about 5m/16.4ft Model: GA-800/GA800 Lithium Battery: 2600mAh Working Frequency: 10KHz-159MHz Operating Temperature: -10 to +60 Working Voltage: 5V/1A Power Supply Mode: TYPE-C charging / built-in 18650/2600mAh Impedance: 50 Gain: 20db Max Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you mind. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Antenna with Control Box 1x User Manual 1x BNC Cable 1x Power Cable (Type-c) 2x Output Cables (BNC-3.5, BNC-BNC) 1x Adapter (BNC-SMA)