Do you wanna a professional -lost ? If yes, it will be a good choice. You don't have to worry about losing things. material that can ensure its durability and practicability. It is simple in appearance design, but very practical in use, which brings great convenience to you. Features -Material: PC -Size: Approx. 3.5 x 3.2 x 0.8cm/1.38 x 1.26 x 0.31cm - with stable performance, featuring a . - 80-100dB high volume alarm, easy to Three kinds of sound Whichever you want. - With an effective distance of about 30 meters, it reminds you to check your personal belongings in time. - With a hanging rope, you can easily it on your personal belongings such as , bags keys or pet chains. - It is compact, lightweight and low energy consumption. Specification -Rated Input: 3V -Rated Current: 3. -Rated Power: 10uW -Sound Volume: About 80-100db -Battery: 240mAh@3V -Endurance Time: More than 12 months (calculated by using 15 times a day) - distance: open ；wide indoor 30 , common indoor environment 10 Package list: 1 x -lost Device