Output and Runtime: The Duo has an inbuilt auto dimmer to protect the electronics in the unit from overheating

Cons: An integrated GoPro mount would be a nice addition

35mm diameter

includes spacers for 31

No helmet mount capability

POC Crane MIPS Helmet - XL-2XL - Matte Black Ignore Wholesale Tier 1 Brand Rule Output and Runtime: The DuoIdeal for Dirt Jump, BMX, Street, and urban riders with its understated looks and a lightweight and highly durable, dent resistant outer shell. The Crane features an innovative dual density liner for optimum protection against a wide range of impact forces and the addition of MIPS improves rotational impact protection. Who's this item for: Ideal for Dirt Jump, BMX, Street, and urban riders looking for a skate style helmet with good ventilation and