Fashion watch design, wireless technology, built-in removable rechargeable lithium battery, low voltage indication, intelligent code, easy to use and simple. Suitable for the elderly, disabled, hospitals, nursing homes, restaurants, kitchens, factories, and other calling applications. This series is widely used in restaurants, bars, teahouses, hospitals, nursing homes, beauty salons, factories, hotels, residential offices, and other service locations. Features include excellent rechargeable battery performance, long standby time, and a complete charge and discharge protection circuit. Includes automatic battery capacity detection. When receiving a wireless call signal, the device emits vibration, buzzer, and flash alerts. Product may vary slightly due to different batches; actual product may have minor differences or color variations, which do not affect functionality. Color: as shown in photo. Material: ABS. Package includes: 1x Wireless Pager, 4x Receiver. Content limited to items listed; other products not included. Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowance: +/- 1-3 cm.