If wall worts are being troublesome use rechargeable AA batteries. I use them in trail cams. They seem to last as long as the one time use batteries.
Just a quick note on this, those terminals (the red and black toggles) are NOT an input for a battery or other power supply. Those are just a Normally Open relay output. So definitely don't connect any power supply to them. See here for more info - M538BS - MURS Basestation Transceiver