Please choose the link below for the appropriate Model:

http://www.willtek.com/english/products/tt/3100/download

 http://www.willtek.com/english/products/tt/4032/download

http://www.willtek.com/english/products/tt/4100/download

http://www.willtek.com/english/products/tt/4192/download

http://www.willtek.com/english/products/tt/4200/download

http://www.willtek.com/english/products/tt/4202R/download

http://www.willtek.com/english/products/tt/4208/download

http://www.willtek.com/english/products/tt/4300/download

http://www.willtek.com/english/products/tt/4350/download

http://www.willtek.com/english/products/tt/4403/download

http://www.willtek.com/english/products/tt/7310/download