Engadget - We've been seeing Bluetooth speaker after Bluetooth speaker debut as of late, but Felt Audio's $99 rechargeable Pulse is one of the smallest of its kind. It supports Bluetooth for up to 40 feet, and it pairs with enabled devices in about three seconds. Battery life is rated for about four hours, and the speaker recharges via micro-USB. The controls are intuitive: you can manage calls and change the device's volume via buttons on the side. A clip on the back can be used as a stand for propping the device up during conf calls and the like.