Featuresr super mini size and lightweight diameter is about 22mm weight about 4gr easy taking and comfortable wearingr csr noise isolation and echo cancellation technology for perfect sound qualityr 10m transmission distance without obstacles r rechargeable just need two hours to be charged and enough to talk or listen to music for 4 6 hoursr simple operation one button with multifunctions like onoff switch answer end reject dial redial a callr supplied with earhook to make it