Alctron DI100 Active DI Box Direct LD Systems DI Box Active DI Box in rugged metal housing (aluminium/steel) with corner protectors, silver-blue/metallic, internal 9 V battery (indicator flashes during operation) automatically switches off when phantom power is used ( LED indicator is always on) Extremely low battery usage Battery : 9V (not included) Specifications Ground lift Frequency response 20Hz - 20kHz THD < 0.0015% 1kHz Noise level - 100 dBu Input impedance > 1 M Ohm Load impedance < 100 Ohm Input: 6.3 mm mono jack + XLR, link output: 6.3 mm mono jack Output: Balanced XLR Maximum input level: +10/+30 dBu