ZKBioGo is an app that developed by ZKTeco Inc, it's for smartphone and other mobile devices which can communicate with both single door controller and multi-door controller to securely open a door or gate, if you have access control device of ZKTeco, it's a great choice for you to use.

Innovative--- Leverages standard communications technologies to support Android operating systems for a mobile solution that is easy to deploy and manage.
Convenient--- Anytime, anywhere, open the door which you want.
Secure safe--- Encryption mechanism for connection and data delivery.

Support various firmwares:
C3 series - AC Ver 4.3.3 Aug 29 2014
Inbio series - AC Ver 5.2. 2 Jul 16 2014
TF1700 - Ver6.64.0012 May 16 2014
MA300 - Ver6.60 Mar 18 2013