Intelligent steering helmet led bicycle equipmentSafe, durable and comfortable: our male and female bicycle helmets meet CPSC and CE safety standards and can withstand any weather. The battery lasts for about 6 hours in batch mode and 3 hours in solid state mode. The helmet fits most head sizes 54 61 cm comfortably. Touch rotation: When you turn, just touch the corresponding button on the included wireless remote. Even with a bicycle helmet you still need to send a right hand signal when you turn!