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It's a great honor for you to visit my store. Good luck with your favorite purchasesHign-concerned Chemical : None Support intercom : YES Item Weight : 0.3kg Item Height : 12cm Item Width : 13cm Item Length : 10cm External Testing Certification : CC Applicable Helmet Type : Universal Special Function : Voice Control,waterproof,Noise Reduction Power Supply Mode : Built-in Battery Connection Mode : Wire Maximum Number of Speakers : 2 Maximum Intercom Distance : <500m Certification : CE Origin : Mainland China Item Type : Helmet Headset The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom'sd policies and EU Product Safety and Compliance laws.