Solinst 115009 Levelogger 5 App Interface. The Levelogger 5 App Interface for the Levelogger Series uses Bluetooth® wireless technology to connect a Solinst datalogger to an Apple® or Android™ smart device. Once connected, the user can view data and program the datalogger using the Levelogger App. The App Interface is compatible with Levelogger’s Direct Read Cable or Adaptor, LevelVent Wellhead, or AquaVent Wellhead Connector Cable. The App Interface is compact in design, and is easily transported. It uses four 1.5V AA lithium batteries that are easily replaced. The Interface has a power button to turn it on and off, and there is an auto-off after 10 minutes of inactivity. A LED light indicates its status.