mobile phone, tablet, computer bluetooth connection can be used.
100% brand with applicable system: ,three systems universal. environmentally friendly, using imported high-grade silicone rubber material, non-toxic, odorless and harmless. silent, knocking silent. fully sealed design, waterproof, , oil proof, anti-corrosion, can be used in any harsh environment, can be cleaned in water, disinfected with cleaning solution, so that germs can be .