ATU-100 Automatic Antenna Tuner: This device is intended for use as an accessory to amateur radio equipment, as part of an amplifier or transceiver, or as a separate device for the function of matching the output impedance of a Power Amplifier (PA) with an antenna feeder. [5000mAh Battery]This product contains a 5000mAh rechargeable battery. The power input port can be connected to a DC 12V power supply, positive inside and negative outside (Note: This device contains a 15V current-limiting diode for power protection, and the fuse will blow when the DC power voltage exceeds 15V)). Before charging, please confirm that the output voltage of the charger is less than 5V (without the charger). [Tuning range] Voltage: 10-14.5V DC; Minimum power required to start tuning: 5W; Maximum current consumption: 400mA; Minimum measured power: 0.1W; Maximum working power: 100W; 0.1W; Maximum measured power: 150W; Power measurement steps above 10W: 1W [Easy to Use]The high frequency antenna tuner requires no assembly and can be used directly. This device is intended as an accessory to amateur radio equipment, as part of an amplifier or transceiver, or as a stand-alone device for matching the output impedance of a power amplifier (PA) to an antenna feeder. [Portable]The size of the qrp antenna tuner is 9x5.1x2.4 inches.The small size allows you to carry less equipment for a better connection experience.Using 0.91-inch OLED dual-color display,the parameters are displayed in four lines:the first line displays the input power value;the second line displays the input power value.The second line: display voltage standing wave ratio;the third and fourth lines display L,C parameter values or antenna output power,efficiency or other key operating status. Colour:black Material:Metal Package Contents: 1 x antenna tuner 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.