Lack of signal. Overcrowded towers. Dead battery. There are plenty of reasons why you might want to have a backup form of communication should your smartphone fail. The Linc Smartphone Walkie Talkie gives you one. Designed to snap onto the back of the Moto Z, it lets you talk at ranges of up to 5 miles, works with non-smartphone walkie talkies, and has a dedicated battery. It also has a retractable antenna, independent volume control, push-to-talk button, and its own speaker, and can be used with the companion app to expand its capabilities.