Feature: 1. Innovative Design: This 1 transmitter to 20 receivers wireless calling system supports call numbers up to 999 and offers various alert options, vibration, sound, or flashing lights, enhancing operational efficiency. 2. Strong Stability: Equipped with imported processing chip set, our caller provides noise reduction encoding and decoding circuit, ensuring strong stability and outstanding performance. 3. Wide Coverage: The keyboard transmitter built in external antenna, receiving distance through the wall can reach 50‑100 meters, working distance in open area is about 1000 meters. 4. Convenient Charging: Keyboard transmitter powered by DC 5V, receiver with lithium battery, 200mAh battery capacity, charging voltage DC 5V. Made from impact resistant ABS, it offers long lasting durability. 5. Widely Used: The restaurant pagers system consists of 1 keypad transmitter and 20pcs pagers. Customers don't have to wait in line, keep social distance, and improve work efficiency. Widely used in restaurants, hotels, hospitals, churches and cafes. Specification: Item Type: Restaurant Pager System Material: ABS Transmitter: Working Voltage: DC5V Working Frequency: 433.92MHz Working Current: 200±30mA Standby Current: 60±10mA Coding Method: Learning Code Receiver: Working Frequency: 433.92MHz Battery Type: Lithium Battery Single Receiver Battery Capacity: 200mAh (Inclusive) Charging Voltage: DC5V Working Current: 75±10mA (Vibration) Standby Current: 10±5mA Reception Sensitivity: -107±2dBm Decoding Method: Learning Code. Package List: 1 x Transmitter 20 x Receivers 1 x Receiver Power Adapter 1 x Transmitter Power Adapter 2 x Charger 1 x Instruction Manual