1. Regardless of the design, most include rechargeable batteries that last for weeks or months on a charge.

2. But it also has a rechargeable battery, so it can juice your smartphone or tablet.

3. This eliminates the need for a wireless connection and the need for a rechargeable keyboard.

4. You get four hours with the earbuds themselves and then another four hours when the rechargeable base is attached.

5. It contains the pump, rechargeable battery and a Bluetooth module for smartphone connectivity.

6. It also has a motion sensor to prevent it from running all the time and prematurely draining the rechargeable battery.

7. Embedded in the clamshell design was a rechargeable battery meant for coming to the rescue of a smartphone running on life support.