Smart Wireless Probe BVM-001 Bluetooth Voltage Meter with Data Logger (BVM-001(Voltage)) Wireless Bluetooth LE communication (10 meters) Ultra low power & Accurate measurement of the current/voltage Smart measurement system of developers to check data and graphs on smart devices - Tablet PC or Simultaneous operation possible with 8 bluetooth LE meters. Maximum 3 months data logging by ultra low power design, Data logger : 4Mbyte