Developer's DescriptionBy UUsafe TechnologyEnable Facebook Chat Heads without worrying about others getting your privacy even they have your mobile phone.UULock is a lock app for chat/messenger support locking Facebook chat heads. The mainstream chat apps, including Facebook, Facebook Messenger, Whatsapp, kik, Skype, are supported. Highlights: no ads, low RAM and battery consumption, anti-kill by task killers(No plugin needed), multi protection with anti-uninstall and anti-clear data.