Powers off 3V CR2032 lithium coin battery
One piezo buzzer
Toshiba's TC35678FSG BLE 4.2 Cortex-M0 (13 or 26MHz) 384KB ROM, 192KB RAM, 256KB Flash.
Diodes PAM8904 12-pin U-QFN3030-12 18VPP output piezo sounder driver, charge pump
Could not identify the two other ICs
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