This part is a kind of semiconductor called 7809.

Function of this product has Voltage Regulator.

Manufacturers : BLUE ROCKET ELECTRONICS

Image and pinout :

Some of the text within the PDF file :

7809(BRCW7809R) Rev.C Feb.-2015 描述 / Descriptions TO-220 塑封封装电压调整器。Voltage Regulator in a TO-220 Plastic Package. DATA SHEET 特征 / Features 三端稳压调整器，输出电流高达 1.5A,内设过热保护和短路限制。 3-Terminal regulators ,output current up to 1.5 A, internal thermal overload protection and short-circuit limiting. 用途 / Applications 电压调整器。 Voltage Regulator. 内部等效电路/应用电路 / Equivalent Circuit or Application Circuit 引脚排列 / Pinning 123 PIN1：IN PIN 2：GND PIN 3：OUT 印章代码 / Marking 见印章说明。See Marking Instructions http://www.fsbrec.com 1/6 7809(BRCW7809R) Rev.C Feb.-2015 DATA SHEET 极限参数 / Absolute Maximum Ratings(Ta=25℃) 参数 Parameter Input Voltage Diff [ ... ]

7809 PDF Datasheet Download