How to operate upgraded Bluetooth 5.0 FreedConn BM2-S Motorcycle Helmet Model 953 Bluetooth Helmet?

Upgraded motorcycle helmet with Bluetooth 5.0 integrated:
1. Upgraded size with new EPS paddings, make size more close to standard size. You can select the size you usually wear, needn't select 1 size bigger due to the built in Bluetooth module
2. Upgraded Bluetooth version to 5.0, connectable with other brands motorcycle Bluetooth headset
3. Add glasses slot, make it more comfortable while riding
4. Add small size
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