Features *The software comes with a built-in function for managing the inventory of inventory items; *Can carry devices with you and expand your search range infinitely; *Use computer software to issue call commands within close range; *One click intelligent inventory on mobile app, completed in three seconds for half a day The workload; *One click call search on mobile app, finding items in three seconds; *Real time monitoring and tracking distance through mobile app; *Intelligent search and monitoring of battery level; *The caller comes standard with two No. 7 batteries, which are easy to replace; *Batch import and export of data in Excel format; *Can call multiple callers simultaneously without interfering with each other's signals; *The signal range of the host is within a radius of 50 to 80 meters from the caller; *The caller lights up in two colors; *The duration of sound and light can be selected as 1 minute, 5 minutes, or 10 minutes Minutes, etc; *Ultra low power consumption, using two ordinary No. 7 batteries for about 3 years; *The main device can be used for 15 hours without power supply; *The caller comes with a shutdown button.