To know 1

Delivery level: fast, I even received prior to the date of delivery.
The device itself: you must know that, when turned on he speaks in English, to say the battery level, when it connects to another device, when tin or lights.
You can not put it on mute.
Audio level, I think the sound is too loud even when I drop to a minimum. (I think it depends on the phone type)
Level autonomy, I've had a long time so I can not say nothing.
By cons I find unfortunate, "with the phone" does not work for (voice recognition) and to talk about applications like Zello.
Efficient light stays very well by ear, fits very well to the ear. (For information, there is a charger "for the category" that can change. There is no car charger (cigarette lighter)
Other information, it works very well with a Bluetooth adapter connected to the PC for voice recognition as Dragon Naturally Speaking or Skype, its level of quality and rude on PC.