Azeca AZM04-BK Clip-On Bluetooth Headset with Retractable Earbud & Vibration, Black Earbud retracts! Listen only when you need to! Securely clips to clothing or hang with neck strap Vibrates when a call is received & Rings in earbud when a call is received Easy-to-reach answer, volume, and voice dial controls Compatible with Smartphones, iPhones, Android, and all mono Bluetooth phones