I thought it was for keys, but you can use almost anything if you attach it to receiver hole. I'm glad batteries came with it. I tested it through a wall and it seems to have good range. I even put the key in the drawer and the beep is loud enough to help us locate the item. That saves time!
π§ Sony WH-1000XM4 Noise-Canceling Wireless Headphones with Alexa & Mic, Blue
330 Review
SAMSUNG Galaxy Buds Live: True Wireless Earbuds with Active Noise Cancelling & Wireless Charging Case - Mystic Bronze (US Version)
252 Review
Black Audio-Technica ATH-M50X Professional Grade Studio Monitor Headphones with Detachable Cable - Critically Acclaimed
200 Review
π« Renewed SAMSUNG Galaxy Buds Pro R190: True Wireless, Noise Cancelling Bluetooth Earbuds
208 Review