Unique Design & High-performance] K3-P is a Bluetooth Headset Sunglasses perfectly which combines Polarized Sunglasses with Bluetooth 4.1Headset. The advanced Bluetooth 4.1 Technology with A2DP/AVRCP support, ensure transmitting strong signal in high quality and high speed, offering high definition sound, both in playing music and answering calls. • [High-quality Polarized Lens] Uses High-quality Polarized Eyeglass (interchangeable lens), providing protection to reduce glare, filter light and protect your eyesight. • [Noise Reduction & Hands-free Call] Adopts Noise Suppression & Echo Cancellation Technology, reducing ambient noises and enables clearer sound from microphone. You can get high-quality hands-free phone conversation even on the street or inside shopping mall. • [Ergonomic Design] Equipped with function buttons (Support controlling Power On / Off, Volume Up / Down, Previous Song / Next Song, etc.) and support Voice Prompts (Power On / Off, Pairing, etc), bringing you much convenience during use. Ultra-light Design (weight only 26 grams) for comfortable wearing. • [Long Standby Time & Fully Compatibility] Built-in 75mAh high capacity rechargeable Li-ion battery lasts up to 4 hours of Talking Time / 5 hours of Music Playing Time and 24 hours of Standby Time per charge cycle. And universally compatible with most Bluetooth-enabled devices, including iOS Android Windows Smart phones & Tablet PC and other Bluetooth devices. Also support automatic re-connection.