This part is a kind of semiconductor called KST-TX01.

Function of this product has wireless transmitter module.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

KST-TX01 Technical spec for wireless transmitter module (1) transmit power:1W (1500m) (2)operating frequency:315MHZ~433.92MHZ (3)operating temprature:-40℃~80℃ (4)operating voltage: 3V~5V (5) modulation type: ASK [ ... ]

KST-TX01 PDF Datasheet Download