Battery back up for your Insignia
If you use your Insignia to listen to audio books, you know the frustration of low-battery shut down right in the middle of a 60-minute chapter. You must plug your Insignia into your computer for several hours for a recharge. This device does two things: (1) Back-up battery power to continue listening, and (2) Recharges the Insignia. Both make this well worth the price of ~$25. My only gripe: recharging through either the computer or the device "resets" the starting point; when you turn the Insignia back on, you need to restart the chapter over again.
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