The "Yellow" battery holder which requires the use of rechargeable AA batteries (not included). I haven't used this thing in quite some time. I did just test with a simplex channel (NOAA weather) and it received that fine.
HOWEVER: If I recall correctly, the reception of this became spurious when my county switched to P25 phase II DIGITAL. I scoured the radio reference forums and what I recall is that earlier models of this scanner had an older component (DSP, or something like that) that wasn't as good as later models in picking up P25 Digital. Sure enough, I went out and found one with a higher Serial Number and that one worked great (right up until our county switched to a "Simulcast" system, which this radio can't do at all, no matter what the serial number).
I think it is supposed to work with other style trunking systems but can not validate any of those. The item "Radio Shack Digital Trunking Handheld Scanner PRO-96 20-526" is in sale since Sunday, November 7, 2021.This item is in the category "Consumer Electronics\Radio Communication\Scanners". The seller is "djbucky" and is located in Plymouth Meeting, Pennsylvania.
This item can be shipped worldwide.