[7th generation] 200 million negative ions + keratin hair care + three-stage - new style in July - [Three teeth] Wireless straight hair comb [capsule anti-scalding]

[6th generation] Tens of millions of negative ions + capsule anti-scalding + second gear - new model in July - [Three teeth] Wireless straight hair comb [capsule anti-scalding]

[5th ​​generation] No negative ions + one gear + low battery life - new July model - [Three teeth] Wireless straight hair comb [capsule anti-scalding]