A BT4.0 module maker based on Nordic nRF51822 solution
Though, what is the actual difference??
The below chart may help everybody to understand the difference between BT3.0 and BT4.0 (based on Nordic nRF51822) current consumption and battery life time for mouse (mice) and keyboard.
The data listed below is just the purpose to provide as a comparison reference data based on same testing sample objectives.
Different manufacturer's products may have varied exact result and performance by individual products!
Nordic nRF51822 has both BT4.0 and 2.4GHz RF transmission mode
Module: MDBT40, a Nordic Approved 3rd Party Module Supplier