Configure the interface description: Entering method: long press the "TUNE" button, and turn on the power switch at the tail at the same time. After the interface displays "OPTIONS", release the "TUNE" button to enter the setting interface. Operation method: short press the "TUNE" key to modify the current value. Long press the TUNE key to switch the setting items. Description of each option: Automatic mode (ON/OFF): Freely control the automatic mode of the antenna tuner, eliminating the need for the automatic button, which is more convenient to use. If the device is not going to be used, this value can be set to "ON" to enable automatic mode. The default value is "on". Loss display (ON/OFF): Control the loss calculation display interface arbitrarily, the display is more intuitive. When the input power is sufficient to measure SWR correctly, it indicates the power sent to the antenna and the efficiency of the receiver and transmitter. Fider Loss (0.0-9.9): The wire loss value can be freely defined, and the antenna efficiency can be calculated more accurately. This value is used to calculate the power sent to the antenna. The loss value can be found in the reference data of the cable used, or you can measure the exact value yourself. ATU Antenna Tuner Product Parameters: 0.96 inch automatic day adjustment Display: 0.96 inch OLED Key Features of HamGeek ATU-100 Pro+ 7x7 Antenna Auto Tuner: Operating frequency: 1.8-55 MHz Built-in 3.6V lithium battery 1350MA USB charging current: 1A Current: 300ma Power: 120W Measurable power: 150W 1W: Need to start setting minimum power Minimum possible measurement power: 0.1W Power measurement steps below 10W: 0.1W Power measurement steps above 10W: 1W Power measurement accuracy: 10% Specified inductance: 8.4 uH capacity Inductor minimum installation step: 0.05H Mounting Capacity: 1870 pF Capacitor Minimum installation steps: 10pf Material: Aluminum alloy colour: black Package Contents: 1 x Antenna Tuner 1 x USB cable 1 x Chinese-English Instruction Manual