Multi-function button: tap to answer when you call, long press to reject; tap twice to make a call; tap to play music during standby; tap to stop during playback
Medical silicone ear cap: comfortable for a long time, no fatigue
Intelligent multi-component: wireless Bluetooth headset unilateral hands-free driving to call; wearing a pair of headphones, ear hooks, charging lines, etc.
With microphone interface: say YES is to answer, say no is to reject
USB charging port: Most Android phones, charging line matching