https://www.bearcatwarehouse.com/scanners/trunk-trackers/handheld/bcd436hp.html
Here is a link for another scanner I was looking at. I would need to be portable with it.
The 536HP is portable only in the sense that it can be mounted in a vehicle, or used as a base at home.
The 436HP is portable in that you can operate it using batteries, or power it from a power supply (wall wart) at home, or a cigarette lighter type adapter in your vehicle. The advantage of a true portable, besides the fact it can be used anywhere, carried room to room at home, used outside the house, such as on a deck, where ever you want, is that it also can keep working (as long as you have charged batteries or a vehicle adapter available) in case of a major, long lasting, power outage. The base/mobile scanners, such as the 536HP, BCD996P2, or Whistler's WS-1095 (soon to be joined by the WS-1098) generally have better sounding audio, due to a bigger case and speaker.
For the 436HP (the link you provided), it's about $30 cheaper on
Amazon.