Measuring power range -75 - and16 dBm (external RF attenuator can be extended to 100dBm). Measuring power resolution 0.1 dBm. Measuring frequency range 1 - 600 MHz. Output interface SMA_K. Working voltage 6 - 12 . Operating current Less than 45 mA (backlight on). Operating temperature -40 degree - 65 degree. Storage temperature -40 degree - 65 degree. Interface display and operating instructions: 1 The main display shows the first line RF Power Meter The second line shows the P power dBm AT attenuation dB The main menu can not be adjusted for measurement results 2 Function Menu: A The attenuation setting menu: The first line shows the Attenuation Menu The second line shows ATTN: XXdB To enter the menu function : long press ENTER and then press ENTER SUB to execute and, - operation B Internal Compensation Set: The of ADC Offset Menu The second line Offset: To enter the menu function : Press ADD and SUB ENTER at the same time to exit ADD SUB to execute and, - operation C, automatic backlight function: to open the backlight by pressing any button when without backlight. Colour:green and black Material:plastic Package Contents: 1 x RF Power Meter Only the above package content, other products are not included. Note: Light 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.