Model:B6913DF9900FH2484 Product name: Couple induction bracelet vibration flash Size: Women: 225+5mm, Men: 245+5mm, Adjustable Material: 316 steel, Milanese cord, leather cord, zirconium stones Colour: see main picture Packaging: smart bracelet x2, jewellery box, charger x 2, manual x 1 Connect to the App via Bluetooth, and pair up successfully in the App on a one-to-one basis. Touch the jewellery, send your love, and your jewellery will vibrate and flash no matter how far away it is. Each pair is only paired with each other, so you don't have to worry about stringing them together. When your phone calls, it vibrates and flashes. You can set the colour of the flash for three important contacts and the jewellery will vibrate and flash when the call comes in. Different moods, different flashing vibrations. You can send 5 different moods from the app, such as "I miss you, I love you, I'm sorry, I need you, I'm sad", to make the other person flash a different light. The back is engraved with the famous love quote from the world famous book "Sense and Sensibility" "My heart is ,and always will be yours". Waterproof for life. Rigorously tested for water resistance in everyday life, covering many scenarios. To prolong the life of your jewellery, we recommend that you do not wear it when you are swimming, bathing, etc.