Hi Shaun.
Is this of any use?
Complete with instructions.
Features are as follows;
Single button operation
LED segment display
Adjustable punch control
Active frequency control
Auto run function
Auto brake function
Start brake factor
Launch control
Inline micro FET power stage
Size ; 40*28*18mm
Weight ; 20g
Voltage ; 5.0-9.6v
£15 posted first class
Dan