Griffin Trainer iPhone 6 sets linked to the movement arm of your favorite sports， whether jogging， cycling ..... etc.， can be easily put on the headphones socket movement arm hang and enjoy side movement while listening to music fun. Griffin Trainer Movement arm hanging sleeve made of rubber material sense of cool mining side there are holes design， can keep cool and comfortable. Arm hanging front cover is transparent plastic material to protect the screen is also easy to operate. Product Features: ● use elastic cuff design， more convenient wear. ● elastically stretchable elastic characteristics， allowing you to adjust to a comfortable tightness， up to 48 cm long. ● Ultra-thin arms hanging sleeve， mining rubber material sense of cool， fresh and comfortable. ● movement arm with the side holes design， keeping cool and increase ventilation and comfort. ● arm hanging front cover transparent plastic material to protect the screen is also easy to operate. ● Screen peripheral silver reflective trim design with fluorescent green car suture， in the dim light， it was easier to be seen.