Sonos - ZonePlayer ZP120 - Multi Room Wireless Audio amplifier

The Sonos ZonePlayer ZP120, later renamed the Connect, is a compact and smart streaming amplifier that directly connects passive speakers to the Sonos ecosystem. Thanks to the efficient Class D amplifier, this small device delivers surprisingly a lot of power without getting warm, making a cooling fan unnecessary. It streams music services, internet radio, and local music files effortlessly throughout the home via the stable SonosNet.

Frequency response: 22 Hz – 20 kHz ±3 dB
Total harmonic distortion: < 0.02%
Signal-to-noise ratio: > 98 dB
Ethernet ports
Power supply: 100–120 / 220–240 V, 50–60 Hz

The Sonos works perfectly.
For a better impression see photos