Martian Motorcycle Bluetooth Helmet Modular Full Face Flip up Dual Visor Bluetooth Headset: HM-BH Color:2 Way Glossy White (2)Take measurement two to three

(2)Take measurement two to three times to pick the largest one

Color：Microphone 5Pin 2in1

Manufacturer Part Number: HGXP14B

Cable Feature：Retractable

Manufacturer Part Number: HJK311

Martian Motorcycle Bluetooth Helmet Modular Full Face Flip up Dual Visor Bluetooth Headset: HM-BH Color:2 Way Glossy White (2)Take measurement two to threeFeatures Advanced Modular Flip up and Dual Lens Design (inner smoked lens outer clear shield); Two Way: Motorcycle Bluetooth Headset supports up to 3 riders intercom, 500 meter communication, 12 hr phone talk time, 9 hr intercom talk, 3 hr charging time and 120 hr standby time; Six Way: Motorcycle Bluetooth Headset supports up to 6 riders intercom, 1000 meter communication, 12 hr phone talk time, 9 hr intercom talk, 3 hr charging time and 300 hr