Brand name: LIVALLProduct: Smart Helmet Weight: about 307gSuit size: 51-57cmMaterial: EPS PVCStyle: integrally-molded helmetNumber: HL5006Noticed: Can only choose helmet,Website:://.szecw.com,but if without the remote control,Left and right steering function will failFeathers:1.Bluetooth phone app wireless connectivity,music player,voice calls.SOS alarm system ect core technology2.24 air vents,3.Soft and comfortable lining.wearing no sense of restraint,effectively resist the impact more safety,good ventilation effort,to ensure fresh of headIf you want know more helmets please click here: Helmet