Features: Fix the stainless steel ring on the outdoor receiver.Connect the outdoor receiver to the indoor power supply with a 5 or 10 meter feeder. Use a 1 meter feeder to connect the power outlet to the radio. When using, try to put the antenna in a high place outdoors, the principle of electromagnetic interference. Charge in for time when the power light is off (or the signal becomes weak).Pay attention to strikes when using (disconnect the link in for time) Do not use the antenna to listen to the radio while charging to avoid interference. Specifications: Materia:Metal Frequency Coverage: 100KHZ-179MHZ Working Voltage: 9-12V Charging Interface: TYPE-C Battery: Built-in 18650 lithium battery (pay attention to the positive and negative poles of the battery when replacing the battery) Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Outdoor Antenna (receiver + stainless steel ring) 1x Power Supply Unit (built-in 18650 battery, TYPE-C port) 1x 10m Feeder 2x 1m Feeders (3.5 andBNC) 2x Connectors (SMA+Inch F) 1x Power Cord