This Security Pack sensor kit does a great job of extending the functionality and usefulness of the Presence DIY home-monitoring app, but most will find the cost is too steep for what it delivers.
The Duracell Powermat 24-Hour Power System is great for keeping two gadgets powered all day, but is best suited for iPhone 4 and Samsung Galaxy S3 owners.
The Medis 24/7 fuel cell Power Pack is a great back-up gadget electricity supply for emergencies and camping trips.
Pricing not available
The Diamond XtremeTV PVR660 USB 2.0 Power Pack Edition boasts the best combination of features and quality of any external TV tuner we've seen, but it shares the same image-quality problems as other TV tuners.