WiTenergy v2018 Bluetooth Smart Electricity Usage Monitor and Programmable Timer for Samsung Note8, iPhone8, iPhoneX, iPad Pro World first and smallest Bluetooth energy meter to measure electricity usage and control appliance Measures Voltage, Current, Wattage and Power Factor to identify low-efficiency appliance Programmable on/off, countdown and random timer control on your Android or iOS smart devices Auto On from power cycle recovery, Manual on/off button, overload alert and auto cut off Manage up to 30 units in a single Smartphone or Tablet, Free app available on iOS (App Store) and Android (Google Play)