KO-STAR W21 Portable Sports Magnetic Headsets Bluetooth Neckband Headphones Wireless Earphones with Dual Batteries – Black

• Bluetooth earphone with card reader: can also listen to music without a mobile phone, support plug-in card play, maximum support 64g memory card

• Connected with two different Bluetooth devices: smart one drag two, you can connect two mobile phones at the same time when listening to songs, you are not afraid to leave the work phone

• Magnetic design: It can be easily closed and hung on the chest to prevent the earphone from winding and is easy to carry

• Fast pairing: Memory connection function, connect a boot, automatic connection, simple operation, absolutely cumbersome

• Bluetooth version 5.0: more stable, faster transfer,  lower consumption

Specifications:

• Bluetooth chip: version 5.0

• Bluetooth protocol: HSP, HFP, A2DP, and AVRCP

• Working distance: 10m

• Battery: dual battery 1000mAh

• Drive unit: 12mm neodymium iron boron

• Sensitivity: 100dB±3dB

• Frequency: 20-20KHz

• Audio signal to noise ratio: 98dB

• Working time: 100 hours