Featuresr build in microphone support telephone call and musical listeningr super mini size and lightweight diameter is about 22mmr cosy earbud design comfortable to wearr bluetooth wireless 10m transmission distance very convenient r rechargeable just need two hours to be charged and enough to talk or listen music for 3 hours r support connecting two devices simultaneouslyr simple operation one button with multifunctions r supplied with earhook to make it hard to fall