The description :

• The transistor is an electronic component with three active electrodes which is used in most electronic circuits, it allows to control a current or a voltage on the output electrode This is a bipolar junction transistor named B772.
• A bipolar transistor is a type of transistor that uses both electrons and holes as charge carriers.

It has 3 terminals, which are:

• Transmitter.
• Collector.
• Based.

Specifications:

• Type: bipolar PNP
• Model #: B772
• Package type: TO-126
• Current: 3 A.
• Voltage: 40 V.
• Power dissipation: 500 mW
• Junction operating temperature range: -65 – 150 ° C
• Technical sheet : https://pdf1.alldatasheet.com/datasheet-pdf/view/693847/WINNERJOIN/B772.html