Um3561 three siren sound generator trusemi um3561 three siren sound generator 3v operating voltage 150ua operating current 3ma output current 106 5khz oscillating frequency 10 to 60 c 8 dip case three alarm sounds and one sound effect mono tone performance a magnetic speaker can be driven by connecting an npn transistor fast test capability power on reset designed for use in toys applications trusemi um3561 three siren generator