Compatibility:Compatible with iphone 6/6s/6 plus/7/7 plus/8/8 plus/x/xs/xs max/xr earphones headphones

Note:It does not apply to 3.5mm headphone jacks.

Pure and powerful bass

STongmu will provide you an amazing listening experience. 

An acoustic port on the housing controls air flow for the low frequency range, and optimizes diaphragm movement to enable more accurate reproduction of bass. And the High Definition speaker driver can provide a pure, deep bass response.

Lightweight design

The light weight design optimized for maximum comfort to match your active lifestyle like running, jogging, cycling, driving, camping, hiking gym exercise and other outdoor sports.

Sturdy materia

STongmu headphones are made of Premium Aluminum Shield, Copper Wire Core and ABS materials that are rugged and durable and will not be damaged even in the event of any bending. So it's durable for repeated use.