E9 bone conduction Bluetooth headset $ 36.94 Plug: Bluetooth Bluetooth version: 5.0 Wearing method: earhook Compatible platforms: Android IOS Mode of operation: push-button Interface: USB Support mode: A2DP, hfp, HSP, AVRCP Battery capacity: 220mAh Appearance size: 62mm*53.4mm Applicable people: business, elderly, adult, fashion, public, children