yes, i believe the pro 2006 does keep the memories while plugged in and the 9volt is for backup when not. mine has been in the radio for years, but i always have it plugged in. my only beef with this scanner is the display light. mine still works but dimmer than when new. i only use it when i have to and never leave it on while scanning. does anyone know where these can be purchased and/or how difficult the light is to replace? sure wish there was a way put alpha tags on frequencies. but, this is an old school scanner, i realize that and would not trade her.
Scott - N5XTC
*Working the WORLD on HF and winning QRZ awards. BEWARE of OP who participates in forums and claims to own equipment he does NOT own. Only a SAD little man does this!