The Rockbros SP251 polarized cycling glasses use Bluetooth 5.2 technology and 2 Hi-Fi speakers, located in the front and back of the temples.The open audio design allows you to talk and listen to music while remaining aware of your surroundings.Functions are operated via a touch-sensitive panel.- you can answer a call, switch a song or launch a voice assistant without having to reach for your phone.Features:TAC polarized lenses:- The glasses use TAC lenses, which eliminate light reflections and glare reflected from asphalt, water or glass.The solution used improves visibility in strong sunlight and reduces visual fatigue.Lightweight design and adjustable components:- The body, made of TR plastic, weighs about 43 g.The temples are ergonomically contoured, and the adjustable nose piece makes it easy to fit different face shapes.Thanks to the flexible design, the glasses are stable and do not cause pressure points.The lower edge of the lenses has been protected from scratches by laser engraving.Option to mount corrective glasses:- Inside the frame, there is room for an additional frame for users with vision impairment.Corrective lenses up to 400 degrees of myopia and 200 degrees of astigmatism are possible.The frame is included, but lenses must be purchased separately.Power supply and magnetic charging:- The built-in 120 mAh battery provides up to 6 hours of music playback or 5 hours of talk time.In standby mode, the glasses run for about 60 hours.Charging is done via a magnetic cable and takes about 2 hours.Included:- Polarized cycling glasses.- Frame for corrective glasses.- Case.- Cover.- Cleaning cloth.- Magnetic charging cable.- User manual.Specifications:- Material:TR + TAC polarized lenses.- Bluetooth version:5.2.- Supported protocols:A2DP, AVRCP, HFP, HSP, SPP, GATT, HOGP, PBAP.- Audio decoding:SBC / AAC.- Bluetooth range: