Power to ECG-P2

[toodle_pipsky]

I know I've found this elsewhere because I have powered up an ECG-P2 a few months ago, but for the life I me I can't remember or find the source where I got the info (although I'm sure it's staring me in the face!). Which side is + and which is -?
Thanks!

 

[toodle_pipsky]

Ugh, going blind. Can see the small - and + on the faceplate . . . . - close to outside of board, + next to rj45 connection.