• Two-way 18W fast charge; 14.1mm thin unabated; high density lithium polymer batteries
• Optimized charging/discharging efficiency up to 93% conversion rate; USB-C connector
• The water and corrosion-resistant surface is rigidly designed for everyday use
• Slimmer? safer? premium lithium-ion polymer batteries sourced from reputable suppliers
• Adjustable pupil & sight distance