Frequency range: 3.5MHz-54MHz Allowed Supply Voltage Range: 10-15 V DC(There is no built-in battery. The power supply is not included) Maximum Current Consumption: 500 mA Maximum Operating Power: 150 Maximum Possible Measured Power: 300+ (SSB) Recommended Usage Power: Not 250 (SSB mode), Not 150W (CW, FM, ) Minimum Power Required to Start Tuning: 5W (recommended 8W-15W) Minimum Possible Measured Power: 0.1 Watt Measurement Step at Power up to 10 : 0.1 Watt Measurement Step at Power 10 : 1 Watt Power Measurement Accuracy: 10% Maximum Installed Inductance: 8.53 H Inductance Minimum Step: 0.05 H Maximum Installed Capacitance: 1869 pF Capacitance Minimum Step: 10 pF Typical Consumption: 200-300 mA Color: Black Material: Aluminum Alloy Package Contents: 1 set x HF Automatic Antenna Tuner 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.