I want my cans to notify me visually and audibly of three things: Start-up, shut-down, and recording failure. Those events are very important and I don't care if it's voice or sound; just let me know of them. I also don't see any need for lights to indicate other than normal functioning; give me one to show if the the cam is on or off and let it blink or add another one for recording failure.
And illuminate the "lock file" button so you can find it quickly at night. One LED there can do all this.
The rest doesn't matter to me personally
But I can see where others may not want that (other than recording failure) so sound should otherwise be a user-choice, at least as far as on or off. My hearing is awful but the voice of the A139 is clear and loud enough for me to hear and understand it up close, which is probably the right volume level for most folks
Ideal would be user-choice of voice or sound or silence for each individual function but we're getting complex there and it may not be easily possible for the manufacturer, so
probably the best approach would be a "mute" function in the menu that ceases all sound except recording failure notification. Lights should also be similarly in choice.
Right now with my B2W and A139 running at night, my old bus looks like it has a Christmas tree mounted on the windshield at night from behind
That is NOT stealthy and I'd rather have stealthier functionality here.
One light is sufficient for parking mode and it shouldn't be bright These is my only complaints with the A139's signaling.
Phil