Soundlab 4 Channel Mono Microphone Mixer With Effects is a micro mixer that can expand a single input on a music mixer to take up to 4 microphones. The product features digital echo on the output with delay and volume controls.
The unit can be powered by a 9Vdc power supply (not supplied) or a 9V PP3 battery (not supplied).
To insert a battery, push inwards on the battery cradle (on the right hand side of the unit) and slide up to remove the battery cradle. Insert a 9V PP3 battery making sure to observe the polarity marked on the bottom of the cradle. Re-insert the battery cradle and slide the catch down to lock the battery compartment.