-[Easy to Use] One-touch alarm and push notifications help prevent accidents. Full-time mobile app monitoring, with push notifications when the button is pressed. -[Mobile Control, Device Sharing] Pair Tuya with the Smart Life app to monitor your device in real time via your smartphone. Share your device with member using the device sharing feature. -[Compact and ] Compact and , it's suitable for a variety of situations. Simply hang it around your neck or attach it to a with double-sided tape. -[Extended Standby] Built-in 400mAh rechargeable polymer battery offers low power consumption and long standby time. A single charge provides over 3-6 months of use. Standby Current: 0.1A Average Current: 12mA Built-in Battery: 3.7V/400mAh Polymer Battery Charging Time: 1 hour Wi-Fi: 2.4G Color: White Material: ABS Package Contents: 2*Elderly SOS Button 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.