vail amp 3 - in wall flush mount stereo 60 watt amplifier for amazon echo dot (3rd gen) vanguard dynamics the vail amp 3 easily turns any amazon echo dot into an in-wall high-performance audio source. the small fully contained amplified assembly firmly holds the dot in an attractive wall dock that allows for accurate voice intelligibility and convenient light switch level access to the dot’s surface controls. its high-power amplifier can be connected to up to two pairs of any in-ceiling, in-wall or cabinet speakers. the vail amp 3 becomes your in-wall volume control keypad, voice control, and streaming music source.