1. Multifunctional 1 transmitter with 4 receivers, can find multiple items at the same time. 2. No APP required, easy to operate, just one click of the button, the sound will remind you. 3. The receiver uses CR2032 button batteries (not included), one battery can be used for up to 6 months. 4. With loud sound, the volume is 75‑80 decibels, the search distance is 15‑30m/49.2‑98.4ft in diameter. 5. To attach keys, wallet, remote, glasses, phones, dog collars or other things that are easy lost conveniently.
