What's in the box:

CNC Aluminum Alloy Helmet Stick Extension Arm Mount for GoPro Hero 7 5 6 4 for Xiaomi Yi for SJCAM SJ4000 for EKEN H9 Sport Camera Action Camera Accessory (Black)

Features:
The helmet extension arm can be attached to a helmet while riding a bike and racing.
It helps riders, racers and cyclists record their every moments.
Take your shots to the next level with the arm 180 degree self photo shooting camera mount.
Compatible with most action cameras, such as for GoPro Hero 7 5 6 4, for Xiaomi Yi, for SJCAM SJ4000, for EKEN H9, etc.
Made of high strength aluminum alloy, lightweight and durable. Adopt advanced CNC manufacturing process, making it very exquisite.

Specifications:
Material: Aluminum alloy
Color: Black
Compatible Cameras: For GoPro Hero 7 6 5 4, for Xiaomi Yi, for SJCAM SJ4000, for EKEN H9 action cameras, etc.
Arm Length: Approx. 20cm / 7.9inch
Package Size: 23 * 2 * 2cm / 9.1 * 0.8 * 0.8inch
Package Weight: 50g / 1.8oz

Package List:
1 * Helmet Extension Arm

Note:
Action camera and waterproof housing are not included.