This part is a kind of semiconductor called UTC2411.

Function of this product has Tone Ringer.

Manufacturers : Hangzhou Silan Microelectronics

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Some of the text within the PDF file :

UTC2411 TONE RINGER DESCRIPTION The UTC2411 is a bipolar integrated circuit designed for telephone bell replacement. LI NEAR I NTEGRATED CI RCUI T FUNCTIONS *Two oscillators *Output amplifier *Power supply control circuit FEATURES *Designed for telephone bell replacement. *Low current drain. *Small size 'MINIDIP' package. *Adjustable 2-frequency tone. *Adjustable warbling rate. *Built-in hysteresis prevents false triggering and rotary dial 'CHIRPS'. *Extension tone ringer modules. *Alarms or other alerting devices. *Adjustable for reduced supply initiation current. DIP-8 BLOCK DIAGRAM R2 C3 R3 4 7 6 C2 1 POWER SUPPLY (WITH HYSTERESIS) 5 2 Note:R2,R3,C2 and C3 are parts externally mounted ABSOLUTE MAXIMUM RATINGS(Ta=25°C ) Characteristic Supply Voltage Power Dissipation Oper [ ... ]

UTC2411 PDF Datasheet Download