From the datasheet: > Energy Generated: 0.33 mWs actuating and releasing I assume it means that it generates 0.33 mWs (or mJ, come on) in a full cycle of actu

From the datasheet: > Energy Generated: 0.33 mWs actuating and releasing I assume it means that it generates 0.33 mWs (or mJ, come on) in a full cycle of actuating and releasing. So you have to make 3 button presses per second to generate 1 mW of power.