Here is a smart energy meter that measures voltage, current, power factor, and wattage and transmits the data to your smartphone via Bluetooth. The WiTenergy Bluetooth Smart Energy Meter is also a programmable timer. You can use it to control, program, and monitor energy usage of your appliances. The device does have a manual on/off button.
The WiTenergy E100S pairs with your smartphone or tablet to help you measure your energy usage. It offers overload protection as well. You can find out more here.
You may want to see:
*Our articles may contain aff links. As an Amazon Associate we earn from qualifying purchases. Please read our disclaimer on how we fund this site.