This part is a kind of semiconductor called HT7610A.

Function of this product has General Purpose PIR Controller.

Manufacturers : Holtek Semiconductor

Image and pinout :

Some of the text within the PDF file :

HT7610A/HT7610B/HT7611A/HT7611B General Purpose PIR Controller Features · Operating voltage: 5V~12V · Standby current: 100mA (Typ.) · On-chip regulator · Adjustable output duration · CDS input · 40 second warm-up Applications · PIR light controllers · Motion detectors · ON/AUTO/OFF selectable by MODE pin · Override function · Auto-reset if the ZC signal disappears over 3 seconds · 16-pin DIP package · Alarm systems · Auto door bells General Description The HT761x is a CMOS LSI chip designed for use in automatic PIR lamp control. It can operate with a 2-wire configuration for triac applications or with a 3-wire configuration for relay applications. The chip is equipped with operational amplifiers, a comparator, timer, a zero crossing detector, control circuit, a voltage reg [ ... ]

HT7610A PDF Datasheet Download