This part is a kind of semiconductor called M1E.

Function of this product has WIRELESS DOOR CHIME.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

DOOR CHIME WIRELESS DOOR CHIME 遙控門鈴 IC GENERAL DESCRIPTION 功能敘述 M1D-BL The M1D-BL is a CMOS ASIC for wireless door bell receiver use. It will receive the RF signal from M1E (ENCODER) and give a DING-DONG output if address are checked the same.. FEATURES 產品特長 • Same Rosc matched to the ENCODER M1E • 28 = 256 codes, “0”, “1” binary • 3 cycles checked each time • BZ : DING-DONG / DING-DING sound • 1T : 1 time option (default 2 times) • RC envelop APPLICATIONS 產品應用 • Wireless door bell, visitor chime etc.. BLOCK DIAGRAM 功能方塊圖 X Oscillator Y Freq Divider ENV DI Central 1T A0 Input Control Control Logic unit Output Driver VT BZ A7 *All specs and applications shown above subject to change without prior notice. ( 以㆖ [ ... ]

M1E PDF Datasheet Download