It's called a radioisotope thermoelectric generator (RTG), and NASA relies on them for long- distance space missions. RTGs are essentially batteries powered by radioactive plutonium- 2.

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As the plutonium naturally decays, it generates heat, and the battery casing turns the escaping warmth into electricity. Plutonium- 2. 38 is pretty much impossible to turn into a nuclear weapon, according to the Environmental Protection Agency. Its radiation is not the kind of dangerous, skin- piercing radiation that humans have to worry about (unless it is inhaled). Still, a nuclear battery is dangerous to have around because it's very hot.

Smart watch reviews - Consumer Reports. Pebble Watch, $1. Claimed battery life: 5 to 7 days. Weight: 1. 4 ounces. Works with: Android 2. Phone 4, 4. S, 5 and 3rd and 4th gen i.

Smartwatch Reviews We tested the Moto 360, Samsung Gear Live, LG G Watch, and three other new models to help you make a smart choice.

Pod Touch, i. OS 5 or newer required. The Pebble Watch was one of the first to market (check our first- look Pebble review). Although it's more basic than the offerings from Samsung, Sony, and Qualcomm, it's pretty useful, channeling e- mails, texts, and other notifications from your smart phone or tablet. The Pebble also runs a wide variety of apps from third- party developers, including fitness apps for bikers, runners, and golfers. In fact, Pebble very recently announced its own App Store, which is reachable through the Pebble phone app.

The company says that more than 1,0. The Pebble comes in five colors. There's also a new, stylish- looking version of the smartwatch shipping soon, the Pebble Steel ($2. What we liked. The Pebble works with Android and i. OS mobile devices.

Its so- called . And there's a very active user community at the company's online forums. We had fun turning on its backlight with a flick of the wrist, and the magnetic charger is easy to use. What we didn't like. The Pebble doesn’t have NFC, and you have to find the smartwatch app in the appropriate app market for your smart device, download it, and install it. And it has a button- based (non- touch screen), small monochrome interface.

Bottom line. Of the basic watches, we like the Pebble best, for its display, platform, and engaged online community.