Slim Hand Warmer and Mobile Battery

It doesn’t really fit with the country's popular image but Japanese winters can be quite harsh (even in Tokyo and Kyoto) and this is why locals have been using portable hand warmers called kairo for centuries. The Slim Hand Warmer and Mobile Battery is one of the latest developments in that field, harnessing technology to make it warmer than traditional kairo and also give it extra functionality as a power source for your smartphone or tablet. And because style matters, it comes in cute pastel mocha, smoky pink, or mint green colors!

Another part of its usability is its compact size: at just 102 x 42 x 29 mm (4 x 1.7 x 1.1"), the Slim Hand Warmer and Mobile Battery is so small it fits in almost any pocket, keeping both your body and your hand warm (for greater comfort, it also comes with a dedicated fabric cover). You can connect it to a USB power source to charge it up (this takes about 3.5 hours) and then it stays warm for up to four hours, depending on the setting. And if screen time is more important than warmth, it can keep your phone alive too.

Specs and Features:

• Colors: mocha, smoky pink, mint green
• Temperature settings: low, high
• Temperatures: approx. 45°C (113°F) (low), 55°C (131°F) (high)
• Dimensions: 102 x 42 x 29 mm (4 x 1.7 x 1.1")
• Weight: 124 g (4.4 oz)
• Power supply: DC 5 V, 2 A (USB)
• Power consumption: 10 W
• Power source: 3.7 V 5,000 mAh lithium-ion rechargeable battery
• Charging time: approx. 3.5 hours
• Continuous operation (on full charge): 3 hours (high), 4 hours (low)
• Materials: ABS resin, aluminum alloy, polyester
• Comes with 75 cm (2.5 ft) Type-C USB cable, fabric cover
• Instructions/manual: Japanese