TSdrena Bluetooth4.1 Wireless Earbuds Earphones (None Cable) Stereo Built in Microphone Headset Black HEM-BLWRY3B Wireless Bluetooth earphones connect wirelessly to devices such as smartphones and iPhones They are perfect for use during exercise, such as running, going to the gym, and golf practice, as well as for crowded trains, without handling annoying cables. The ear section is equipped with a remote control and microphone, making telephone calls possible. The earphones adopt the Bluetooth 4.1 standards for low energy consumption. In single earphone mode, they can be used in just one ear (only the left ear).