Bring your old school devices to the 21st century with Tethercell. This gadget holds one AAA battery and seamlessly replaces a single AA battery in your device, be it a remote control, lights, or even your kid’s toys. Then, connect via Bluetooth with your smartphone and their app to power said device on or off remotely — a boon for parents with rebellious children — set schedules, timers, receive alerts when batteries are running low, and even locate misplaced objects.

Check it out at Amazon – $40