So far, scientists have‌β÷ developed an intelli☆ ☆gent hand ring that can automatic₽®↑ally detect adverse ↑☆©physical factors to protect the σ♣↔mselves more safely, an§ d smart rings can also scare✘×☆↔ the attackers and seek help. When it §↔‍∑is detected that the user is in λβdanger, it will be progr​$ammed to make a loud beep, and the ¥λ'red flash begins to flicke÷δr in an effort to scare the attacker§λ>≈s and warn other people in the neig♥•♣hborhood.

"One of the major challenges​σ♦ for attack prevention > is that during the attack, v<σictims often have no conveni≤©ent way to seek help,"₹≠♣ said Ragib Hasan, an asso§ε∏βciate professor at the University of Al‍✘abama (UAB) in Bermingham,®✔ America. "Wheth'§‍±er you call 911 or use emergenπ®♣cy alert applications or devices‍₩←, these tools require the user ←α§to press the button to seek he ←‍>lp. This is usually  γnot possible, and violence is h ₽appening, or if a pers×®on is unconscious bec♣♠<ause of an attack, "Hassan said$βσ↔.

Smart bracelet is currently a prin₩β←ciple. It uses machine le≥♦₹≠arning and multiple sens₹£$ors to analyze the acti​$§÷ons of users so as to detect i ∞t when an attack occurs. Once the↑♥€ smart bracelet is detec☆&♣ted, users will be in danger. It will σ✔±give a loud beep and red flashing ligh↔♣ts to frighten the attackers and r↓÷↓emind the people nearb∑£§​y.

The device then connec>←÷ts to the user's smart phone by B>​luetooth, and immediately sends the₹₩₽↕ emergency message a✔ £nd the coordinates of the user's ≠ location to the emer♦φ≠↑gency personnel, and δ✔ε♣the contact list is predefined to t♥<he user through the m↕☆↔obile application.

The bracelet contains×σ a small microcontrolle★✘ r equipped with gyroscopes, acceleroσ←meters, temperature and pressu•∑→↕re sensors, GPS and microphones. UAB g≥↓βraduate research assistan★ t Jayun Patel said: "→∞;these sensors allow bracelet ✘ε₩↓to constantly collect user ac✔Ω↔tivities and vital signs. "It can♣↔×™ also determine the direction of the u" ser, for example, whether they are ≤∏βstanding or lying. Machine lear∏↕ning algorithms can detect and d ≈‍✔istinguish regular movements of ε★users and unexpected an>εd sudden actions, which can indicate σ‌×÷aggressive behavior, ¶∞$"Patel said.

Although the bracelet ↔© is mainly used to detect at  tacks, the elderly or disabled pe₩↔ππople can also use th•★e smart bracelet to aut✘↓✔★omatically detect sudden ™∏ falls or other dangerous movements.