Take control of your digital life through voice commands with the Harman Kardon Invoke Audio Assistant Speaker. This 360-degree device lets you speak to Cortana, Microsoft's smart assistant. Heading out? Ask Cortana what the weather looks like or request traffic updates. In addition, the Invoke speaker allows you to make Skype calls without holding your phone or logging in to your PC. Aside from clever tricks, the speaker is also great for listening to music. The design spreads sound throughout the room, which is great for parties or listening with friends. There are no buttons to look for — even music playback is voice-activated. Because the Invoke is powered by Cortana, it works seamlessly with Windows computers, plus iOS and Android mobile devices.