Sleep Tracking Electronics

Learn how to protect valuable electronics like GPS, satellite communicators and phones from rain, water, dust and more with these tips from REI experts.

This battery guide lists pros and cons of the batteries (NiMHs, lithiums, alkalines and more) that power your outdoor devices.

Two-way radios are great for hikers, climbers and skiers. Before you buy, learn about types of radios, channels, wattage, range and licensing.

Learn the capabilities, basic functions and key features of handheld GPS receivers and get tips on how to use your new GPS unit.

Our article helps you pick the solar charger or portable power technology that’s best suited to your adventure, travel and power needs.

Learn the difference between a personal locator beacon (PLB) and a satellite messenger, and which emergency signal device might be right for you.