Generic Smart Bluetooth Sunglasses.

Hands free phone call stereo music smart voice control color: black polarized lenses dimension: 155mm x 155mm x 43mm net weight: 120g operating environment: temperature: - 10 ~ 50 centigrade; humidity: 0 ~ 90% charger specifications: ac 110v/220v 50/60hz, output: dc 5v max 1a bluetooth: v3.0, support a2dp function transmission distance: 10 meters battery: rechargeable lithium battery (250mah/3.7v), about 2 hours for charging conversation time: about 4 hours music: about 2 hours standby time: about 50 hour