Bluetooth Bone Conduction Smartglasses - Mirrored Blue Phone Calls- incoming phone calls can be declined and accepted by swiping on the touch can be activated Features: Music and audio books have to be started with smartphone on the app that is used or by using voice assistant Transmission Distance 10m-15m Phone-call Time 10 hour Charging Time 2 hours Battery Life 10 hours Charging Voltage DC 5V Max 500mA Bluetooth Mode Headset,Hands-free A2DP Specifications: Dimensions: H:Y cm Guarantee: N Model Number: 37