Sentry Flex Flexible on the Neck Bluetooth Earbuds. 

Features:

• 14 Hours Playtime
• Flexible Design
• Rechargeable Battery
• Built-In Mic
• Bluetooth Wireless V5.0

Specifications:

• Driver Unit: 10mm
• Impedance: 32 +/- 3 ohms
• Frequency: 20Hz-20KHz
• Rated Power: 150mW
• Sensitivity: 100dB
• Battery: Li-Ion