Be careful about using an adapter that is not regulated (ie, keeps the voltage at a precise level). If you use an unregulated adapter that can't supply enough current (amps), it can go into over-voltage and burn out the device.
You should be fine at 7V regulated and 4A available current though. I doubt the 0.5 V difference will break anything; might have difficulty charging an internal battery if you even have one - I would run without just in case. IMHO and YMMV, at your own risk, etc.
You should be fine at 7V regulated and 4A available current though. I doubt the 0.5 V difference will break anything; might have difficulty charging an internal battery if you even have one - I would run without just in case. IMHO and YMMV, at your own risk, etc.