You're looking for the manual for the NetSet PRO44 scanner. Here are a few options to find the link:
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If you don't have the full manual handy, here are the most common steps to get your Netset PRO-44 up and running: NETSET pro-44 - Radio Discussion Community You're looking for the manual for the NetSet PRO44 scanner
Channel Capacity: Features 20 programmable channels, allowing users to store and scan favorite frequencies.
Netset PRO-44 is a 50-channel handheld programmable scanner primarily sold in the UK and Australia. It is virtually identical to the RadioShack / Realistic PRO-44 (model 20-304). Manual Links Netset PRO-44 is a 50-channel handheld programmable scanner
Squelch Control: Manual knob to eliminate background noise when no signal is present.