Active Magnetic Loop Antenna HA SDR Short Wave Medium Wave Radio Loop Antenna Low Noise Adjustable Gain Antenna 100kHz-30MHz<br> <br> The circuit board has reverse connection protection. The reverse connection of the power supply will not burn the chip, but the components cannot be soldered to the back of the circuit board, otherwise the chip will be burned.<br> <br> <br> <br> There are battery buckles or terminals, 9 volt battery power can use battery buckles, other power supply can use terminals.<br> <br> <br> Note: The rear red wire port is positive (+) and the black wire port is negative (-). Please make sure the wiring is correct before powering on.<br> <br> <br> Shipping list:<br> <br> <br> 1. Kits：<br> <br> ① Main Board<br> <br> <br> ② Electronic components<br> <br> <br> <br> <br> 2.Finished Board<br> <br> ① Finished Board.<br> <br> ②Loop antenna x 1. (304 steel wire, steel wire Φ1.5mm, loop vibrator Φ50cm)<br> <br> <br> Note: The battery is only for display, not included in the package<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 1311 hours, wish you a happy shopping!