Item Type: Smart back posture reminder Material: Silica gel Lithium battery: 800MHA ( built in ) Characteristic: Super elastic, suitable for various body shapes Package List 1 x Smart Back Posture Reminder 1 x Manual 1 x USB Charging Cable 1Correct Posture: Are you still worried about your hunchback? Choose our smart back reminder, don't fail to straighten the bracket to provide smart north support, wear it for 2 hours a day, scientifically correct posture. 2Vibration Reminder: When the back is bent, the smart back aligner will immediately vibrate to remind you to sit or stand up straight. You don't realize that you have a hunched back, and the outside world reminds you to sit up straight. 3Weak Soreness: Allows you to form muscle memory, develop upright habits, exercise shoulder muscles, relieve shoulder, neck and upper back Soreness , and form a good posture. 4Material: Silicone material, good elasticity, not afraid of pressure, can be used for a long time, not afraid of not affecting daily life, study and work, not bound. 5Gifts: It is very suitable for children as gifts, giving them to children, not only to show care for children, but also to help children develop the good habit of standing and sitting upright, which will heip them throughout their lives.