Features: Measuring power range -75 ~ +16 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 VDC. Operating current <45 mA (backlight on). Operating temperature -40 ℃ ~ 65 ℃. Storage temperature -40 ℃ ~ 65 ℃. 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 key: long press ENTER and then press ENTER SUB to execute +, - operation B Internal Compensation Set: The first row of ADC Offset Menu The second line Offset: +/- xx To enter the menu function key: Press ADD + SUB ENTER at the same time to exit ADD SUB to execute +, - operation C, automatic backlight function: to open the backlight by pressing any button when without backlight. Package Included: 1 x RF Power Meter Notice: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.Thank you for your kindly understanding