Details Single-Channel 0.4 Amp Portable Power Supply Supports up to 30 Que-Com headset stations or 12 RS-701 beltpacks Line and load regulated Short-circuit protected Item Code PK-7 Technical Specifications dBu is an absolute measurement. 0dBu is referenced to 0.775 volts RMS Mains Input Input Voltage: 100-240V AC Input Frequency Range: 50-60Hz Power Output Output Voltage: 22-30V DC Output Current: <=400mA Output Connectors: (3) XLR-3F Front Panel Connectors and Indicators Input Connector: (1) 2.1mm Co-axial connector Indicators: (2) LEDs: red (overload), green (normal) Environmental 32° - 122°F (0° - 50°C) Dimensions 3.8 x 2 x 4.7in (WxHxD) (97 x 50.8 x 119mm) Weight 1.0lbs (0.457kg)