9vdc@ 2.2 amps 2.1mm plug
Polarity : center positive
Switching style regulated AC/DC Adapter - Lightweight, compact wall mount switching power supply, features a universal input voltage of 100-240VAC 50/60Hz and includes a barrel type (coaxial) output connector as indicated. A unique horizontal 2 pin North American AC plug minimizes space used on power bars and outlets.
Brand name(s): Circuit Test
Manufacturer part# RPR-092A2-P5

Level VI efficiency (energy saving mode with no load = less than .1 watts) : Voltage output will be less than rated voltage, when nothing is attached to the adapter.

Features:
Input: 100-240VAC