1WIRELESS TECHNOLOGY: The wireless calling system utilizes high performance wireless technology, ensuring a stable and reliable connection. It is suitable for various venues and can meet the demands of large scale usage, providing efficient communicate and excellent paging results. 2WIDELY USED: The wireless calling system is suitable for a wide range of applications, including homes, hotels, bars, restaurants, factories, and more. It offers a reliable and efficient communicate solution in various settings. 3TIME DISPLAY: With a built in time display, the system shows the time, date, and day, making it easy to record call times accurately. This feature enhances workflow efficiency and helps to convenient operations. 4LIGHTWEIGHT AND PORTABLE: The wireless calling system is small, lightweight, and easy to carry. Its simple design adds a touch of style, while its portability allows for convenient mobility, making it suitable for various environments. 5RELIABLE AND DURABLE: Built to withstand demanding environments, the wireless calling system features an IPX4 waterproof rating and high sensitivity receivers. It is designed for long lasting durability and reliable performance, ensuring it can withstand daily use and challenging conditions. Item Type: Wireless Call System Model SU 620 Display Receiver: Material: ABS Size: Approx. 210 x 140 x 30mm / 8.27 x 5.51 x 1.18in Working Frequency: 433.92MHz Receiver Sensitivity: -105dB Decoding: Learning Code Waterproof Rating: IPX4 Working Temperature: -20C to 60C Button Transmitter: Material: ABS Working Frequency: 433.92MHz Battery Type: Lithium Battery Battery Model: CR2032x2 Single Transmitter Battery Capacity: 240mAh (included) Transmitter Current: 10mA3mA Standby Current: Approx. 200m / 656.2ft Button Lifespan: 1 Million Times Waterproof Rating: IPX4 Working Temperature: -20C to 60C Double Button: (CALL)(CANCEL) 20 xCallButtons 20 xSticker 1x PowerAdapter 1 xReceiver 1 xInstructionManual