Featuresr build in microphone support telephone call and musical listeningr super mini size and lightweight diameter is about 25mmr cosy earbud design comfortable to wearr bluetooth wireless 10m transmission distance very convenientr rechargeable just need two hours to be charged and enough to talk or listen music for 3 hoursr support connecting two devices simultaneouslyr simple operation one button with multifunctionsr supplied with earhook to make it hard to fall off