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 call systems. This series of products are 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, perfect charge and discharge protection circuit, and automatic battery capacity detection function. When receiving a wireless call signal, the device provides vibration, buzzer, and flash alerts. Note: Product may vary slightly due to different batches, including minor differences in color or design, 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 reflections and display differences may cause slight color variations between the image and actual item. Measurement error allowance: +/- 1-3 cm.