Millenium SG-1, Signal Generator, With the built-in 1 Watt amplifier this device is ideal for (8 Ohm) speaker tests, Line output for active speaker or mixer tests, Tunable frequency between 20 Hz and 20 kHz, Power supply with 9V block battery, Output switchable between XLR line or speaker twist for the speaker test, Dimensions: 110 x 72 x 40 mm