This part is a kind of semiconductor called VD5027.

Function of this product has (VD5026 - VD5028) ENCODER / DECODER.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

ENCODER / DECODER 4 種不同狀態編碼 / 解碼器 VD5026/5027/5028 1.0 FEATURES Wide operating voltage (2 - 6V) Low standby power consumption On-chip RC oscillator, no crystal required Four time transmission with polarity checking Maximum of 4,194,304 combinations encoding capability Minimize external components Easy interface with RF, Ultrasonic or Infrared transmission Media Bonding option available to maximize encoding capacity possible addressing states. (0, 1, open and 4th state) 2.0 ELECTRICAL CHARACTERISTICS 特點 工作電壓 (2 - 6V) 靜態功耗低 芯片上置有振盪器, 無需液晶體 4 次極態校驗發送 最多可有 4,194,304 種編�� [ ... ]

VD5027 PDF Datasheet Download