In today's ever-connected world, few things are worse than being stuck with a battery-drained device, and without a single outlet to plug in. Sure, being stuck with a powered-down phone is annoying, but it can also become a big liability if emergencies or car troubles arise. Save your friends from device-related danger when you get them the GreenLighting Solar Phone Charger this holiday season. The gadget harnesses the power of the sun to give phones a 40% boost in battery life—plenty of power for giftees to give you a quick thank-you call, then continue on their way. Available on Amazon; $44.99.