Solution: JL6973,
Bluetooth V5.3,
headphone lithium battery -3.7V, 35mAh;
Lithium-ion battery -3.7V, 300mAh,
music time: about 5.5 hours (80% volume),
talk time: about 4.7 hours (80% volume),
standby time: headphones about 50 hours,
plus charging case standby about 240 hours,
charging time: headphones about 2 hours;
Storage for about 2 hours, with 25CM charging cable