Patented magnetic system holds up to 30 times the weight of your smartphone. Harmless to the phone: The magnets are located between two iron plates, which cut the magnetic field from the smartphone. Unisex headband - Suitable for thin and regular arms with a circumference of 20 to 38 cm. Wide headband: Does not slip, does not constrict, and lasts long. Headphone outputs compatible with all phones (left, center, right). Opening for fingerprint unlocking (front side). Waterproof textile. Two pocket sizes compatible with all phone brands without removing the protective case: Pocket M: phone max. 8.8 x 15.0 cm, Pocket XL: phone max. 9.2 x 16.8 cm, Pocket XL+: over 16.50 cm. Pocket is not compatible with 2-wheel mounts.