Features Noise Reduction: The loop antenna in this product can help reduce noise and improve signal to noise ratio. The performance is more stable and suitable for more scenarios. Effective Antenna: The loop active receive antenna in this product is an effective antenna for shortwave listeners (SWL) and amateur radio (HAM). Easy to Install: The loop active receiving antenna in this product is compact and features a small size, which makes it easy to carry out installation projects and perform the antenna's proper function. Reverse Connection Protection: The circuit board in this product is protected by reverse connection. The reverse connection of power supply will not burn the chip, but the components cannot be soldered to the back of the circuit board, otherwise the chip Applicable Scenarios: The loop active receiving antenna in this product can be used in places where antennas are routinely needed to perform as antennas should, such as on balconies, rooftops and other places. Specification: Item Type: Short and Medium Radio Module Material: PCB Battery: 1 x 9V 6F22 battery (without battery) Use: Radio Transceiver Package List:1 x Module1 x Battery Connection Cable Note:1. The circuit board has reverse connection protection. Power reverse connection will not burn the chip, but the components can not be soldered to the back of the board, otherwise it will burn the chip2. The rear red wire port is positive (+), the black wire port is negative (‑). Please make sure the wiring is correct before powering up. Package List 1 x Module 1 x Battery Connection Cable