1This antenna tuner can be automatically tuned without any control wires, suitable for most radio stations. 2When in use, press and hold TUNE to turn on and enter the loss manual setting. After setting, the radio station will automatically and permanently remember. 3The device contains a set of 7 capacitors and 7 inductors, which enables it to work effectively in a wide frequency band. 4The antenna tuner is used to compensate the mismatched antenna feed system and provide a resonant, impedance-matched load to the transceiver. 5The tuner has a wide range of applications, including conventional radio scanning, air traffic control, public safety, etc. Item Type: Antenna Tuner Power Supply Voltage: Typical +12V (DC1015V, 13.8V) Built-in Battery: 2000mAH, 3.7V lithium battery Maximum Current Consumption: 400ma Maximum Working Throughput: 100W Maximum Possible Measurement Power: 150W Minimum Power Required To Start Tuning: 5W Minimum Possible Measurement Power: 0.1W Steps for 10W Measuring Power: 0.1W Steps for Higher than 10W Measurement Power: 1W Power Measurement Accuracy: 10% Maximum Installation Inductance: 8.53uH Minimum Installation Inductance: 0.05uH Maximum Installation Capacitance: 1869pF Minimum Installation Capacitance Step Length: 10pF 3 panel buttons, BYPE pass-through, AUTO automatic, TUNE function Display: 0.91OLED 1 x Antenna Tuner 1 x USB Cable 1 x User Manual The device does not consider its own efficiency.