The Radial Phazer Pro Phase Alignment Tool is a must-have for audio engineers and producers. It helps you align two sound sources so their fundamentals play in sync. Features include a Phase-On with LED, Invert switch, Shift control, Blend, Filter-on with LED, Range switch, Cut-off control, Power switch, Cable Lock, and more. Technical specs are Audio circuit type: Active analog phase adjustment, Number of channels: Mono, Frequency response: 20Hz ~ 20KHz (± 0.5dB). Size is 4.5'x 2'x 6'(114x57x147mm), weight is 2.8 lb (1.3kg). Use in dry locations between 5°C and 40°C.