Not bad, sensitive - but beware ....!

That the plug and cable are delicate and thin, has been described many times yes. But Beware !! Much more important is to know exactly which device is to be used for the receiver. The green marking must show to the charger, otherwise the charge is not working. The plug of this device is mounted so that it is right for smartphones, its Micro-USB connector is built into the unit so that the narrow side facing the front of the smartphone. If the socket installed with the narrow side toward the back of the smartphone, you would have to turn the cable and then the closure of the back is nearly impossible. In this case there is a second receiver with the designation BC 341 at Amazon for 6.89.
Otherwise, I think, very useful if you do not often get to pull the plug.