Model NO: YJ33 Bluetooth Version: 5.4 Color: All Colors Stand by Time: 180hours Earbuds Battery: 40mAh Charging Box Battery: 300mAh Charging Time: 1-2hours Charge Voltage: 3.7V Input Vlitage: 5V Transport Package: Gift Box Packing Specification: CE, RoHS, FCC certification Trademark: AiL Origin: Shenzhen, China HS Code: 8517629900 Production Capacity: 500000PCS Per Month