... power detection, digitally controlled attenuator, compact design, and single 5V power supply, with I2C and SPI control interface, also LCD display ... performance is superior. JH-UPC860H is high output (60dBmV) with 30dB adjustable range, power detection, LCD screen interface, and ... a key-board interface. JH-UPC860L has smaller size, fixed low output (50dBmV), non-power detection, no LCD screen ...