The calling host uses an advanced micro-processing chip, which makes its performance stable and reliable. The system consists of 999 keypad pagers and 20 rechargeable receivers.Widely used in restaurants, dessert shops, car 4S stores and other places that require queuing services, it can greatly improve work efficiency and avoid customers being impatient while waiting in line, and improve customer satisfaction.【Features】:◆ 999 channels keyboard pager◆ 20 charging output slots◆ Portable vibration/buzzer receiver◆ Independent data storage to prevent code loss◆ High receiving sensitivity◆ Power-on self-test function◆ Stylish appearance design【Specification】:Product Type: Wireless Queuing and Calling SystemChannel: 999 roadsWorking voltage: DC5V/5AWorking frequency: 433.92MHzStandby current: 24±5mAEmission current: 100 ± 30mAConnection distance: 1000MInput voltage: 100-240V【Packing list】:1 * Transmitter20 * Receiver1 * Power Adapter【Note】:1. Manual measurement, please allow 1-20mm deviation.2. Due to light and screen differences, the product color may be slightly different from the pictures.