Review on Wireless FindKey Key Finder, RF Locator Anti-Lost Tag Alarm Reminder Tracker, 1 Transmitter with 4 Receivers, Ideal for Phone, Pets, Keychain, Wallet, Luggage, Pet Cat, Dog Tracking by Darion Wooten

Cute wire ring key finder attaches the wireless finder to the key and looks "nice". Putting a dead battery in the viewfinder was the only minor issue. The battery cover is opened with a coin by turning it, but the cover does not open, but has to be "pryed open" with a small slotted screwdriver, but I don't see how this could be done differently. When the cover is removed, the discharged battery can be used without any problems. As you reattach the cap, look for the tiny arrows (that look like dots) on the receiver on the small round cap, then lightly tighten clockwise and the receiver is ready. Put two batteries in the transmitter and you're done. Wonderful.