Sierra, attachable speakers on backpack ,which can make people enjoy music while they are doing exercise or outdoor sports with backpack ,is designed to be good partner for all kinds of backpack users. Easy to attach on any backpack straps with velcro band can make people use it in everyday life. People easily worry about the speaker sound which can make other peoples annoyed when they are listening to their own music using this system.
But due to the speakers direction and air density of outside, people can't hear the sound well if they are away 1-2 meter from the system. Meanwhile, with open ears(no using earphone), people can hear other sound like car horn or other peoples yelling. So we would like to recommend this system to the sports peoples who like the music for the safety and real enjoyment.
Business Registry Number: 120-86-03931