Rear panel, 2 audio in (input) jack, 5 backup battery compartment – Philips turbo drive VR550 User Manual
Page 7: 6 ch3/ch4 selector, 7 video in (input) jack, 8 video out (output) jack, 9 rf out (output) terminal (to tv), To insert the backup battery, Important, Rear panel 1 ac (alternating current) power cord
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