Smartring Colmi R02 18.1MM 8 (Black) Netwerk which confirms its high energy which confirms its high energy efficiency up to 91% Pro 9400 Equipment Faux leather Product color Black Connectivity Bluetooth Yes Package contents Quantity 5 piece(s) Packaging information Package width 114 mm Package depth 89 mm Package height 10 mm Package weight 10 g Logistics data Harmonized System Code 85189000 Width of the main (external) locker 456 mm Length of the main (external) locker 178 mm Height of the main (external) locker 680 mm Gross weight of the main (external) locker 2 the ring weighs only 4 0 Battery capacity 17 mAh Operating time Up to 6 days Charging time Approx