Amazon built a natural-language processing system that is one of the easiest to interact with we’ve seen. If you ask a question or deliver a command, you usually don’t have to ask twice. Part of Alexa’s success is dependent on the several very sensitive microphones built into all Echo devices. Alexa is always listening and is quick to respond.

Amazon Echo (2nd Gen) Amazon Echo Plus (2nd Gen) Amazon Echo Dot (3rd Gen)
Dimensions 148.5 x 88 x 88mm, 820g 148 x 99 x 99mm, 780g 43 x 99 x 99mm, 300g
Connectivity Dual-band Wi-Fi supports 802.11 a/b/g/n (2.4 and 5GHz), Bluetooth (A2DP), 3.5mm audio out Dual-band Wi-Fi supports 802.11 a/b/g/n (2.4 and 5GHz), Bluetooth (A2DP), 3.5mm audio in/out, Zigbee controller Dual-band Wi-Fi 802.11a/b/g/n (2.4 and 5GHz), Bluetooth, 3.5mm audio out
Power Power adaptor/cable (5.9ft) Power adaptor/cable Plugs into a wall outlet
Audio 2.5-inch woofer and 0.6-inch tweeter 3.0-inch woofer and 0.8-inch tweeter 1.6-inch speaker
Alexa Yes (Always-on/always-listening/voice-activated) Yes (Always-on/always-listening/voice-activated) Yes (Always-on/always-listening/voice-activated)
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