... each ear wearing9). Three wearing styles.Specification:1) Bluetooth protocol: version 2.1+EDR2) Frequency: 2.4 GHz3) Bluetooth ... time: about 3 hours.11) Color: blackAccessory:1).Charger(optional).2).USB Charging line.3).User guide ... 5.0 Acceptable PCB Tester A410 1 1.0 Acceptable Production Flow: 1.IQC 2.Injection 3.Spraying 4 ... SK-258B, SK-S1, SK-S2, SK-BTI-001, SK-BTI-002, SK-BTI-003, SK-BTI-005 ...