When charging a red light. The connection to the Smartphone is very fast and easy. The telephone volume is good on both sides, there are no communication problems. Listening to music is also very good, the sound is clear. The range I would rate with good ten meters. The reached yes usually also, because you get the smartphone anywhere near.
Thanks to the different sizes of earplugs the headset sits well in the ear. It expresses, not even during extended wear. As long as one or drumming moves normally works fine the. Jogging, however, and at substantial vibrations, the parts go smoothly from the ear. This sucks a bit and I see this Head Set not so ideal.
Otherwise, however, we are satisfied with everything. The price is great, so what you do not find in stores. Knappe 5 Stars.