<b>Product Description</b><br> <b>Stereo speaker provides you with a pleasant and safe riding</b><br> Two stereo speakers are installed on both sides of the helmet,<br> a safe and pleasant riding guaranteed with high fidelity music and audible surroundings.<br><br> <b>Smart Riding App</b><br> Connecting Smart Riding App for a Smarter Helmet Through the BLE technology,<br> functions such as Walkie-Talkie, Smart LED lighting, tracks record, and cycling trip sharing are available for cyclists by running the riding App.<br><br> <b>Extra Long Endurance for Long-distance Cycling</b><br> This helmets adopts a built-in 450mAh super large polymer battery,<br> 15 hours for warning lights only and 4 to 8 hours of music plus warning lights.<br> It makes a great companion for long-distance riding.<br><br><b>Specification</b><br>Product Name: Smart & Safe Cycling Helmet<br> Mode: SH55M<br> Helmet Materia: EPS+PC<br> Weight: 310g<br>Size M: 21.26-22.44 inches(54-57cm).<br>LED Light Bea: 6<br>Vents: 13<br>Bluetooth: BLE4.1+BT4.2<br>Speaker: 2x0.5W<br>Charging Port: Magnetic USB<br>Battrey Capacity: 3.7V 450mAh<br>Battrey Endurance: Approx.10hrs for lighting/3-6hrs for music and lighting.<br>Standby Duration: Max.180 days<br>Charging Time: Approx.3hrs<br>Electrical Parameter: DC 5V/J0.5A