#green_lion_smart_ring_pro ☛#features ✓128 sports mode ✓personal setting ✓ip68 waterproof ✓step target ✓heart rate ✓blood oxygen ✓calories calculation ✓sleep monitoring ✓remote snap ✓durable & comfortable design ✓long battery life ☛#specification ✓brand: green lion ✓material: stainless steel ✓chipset: dialog da 14585 ✓flash memory: rom 128kb+96kb ram ✓bluetooth: v5.1 ✓sensor: hx3918 ✓battery type: lithium-ion polymer ✓battery capacity: 16mah ✓charging mode: magnetic charging ✓charging time: 1 hour ✓battery life: 4-5 days of use ✓standby time: 10-15 days ✓compatible: android 9 & above, ios 10 & above ✓dustproof & waterproof level: ip 68/5 atm ✓#color: #black ✓#size: 9 (18.9mm) & 11 (20.6mm) ☛#package_includes: 1× smart ring pro 1× charging case 1× user manual