1. Compatibility: Exclusively compatible for IOS systems, ensuring seamless integration and functionality across for devices for a superior user experience. 2. This item uses for U1 chip technology for precise location , connecting deeply for various devices for diverse applications. 3. Ultra Slim Card Design: Featuring an ultra slim design, it is one of the thinnest s available, easily fitting into any wallet without adding bulk or noticeable presence. 4. IP68 Waterproof Rating: Engineered to withstand splashes, rain, and even brief submersion, providing peace of mind in environments with its impressive IP68 waterproof rating. 5. Wireless Charging: Equipped with a rechargeable battery that offers long-lasting usage and supports wireless charging, ensuring convenient reuse with a standby duration of 3-4 months. Sensing mode: Bluetooth-Compatible Alarm duration: 10 seconds Standby time: 3-4 months Alarm decibel: 60-70dB Color:Black & Gray Material:plastic Package Contents: 1 x Wallet Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.