1、Included: Wireless queuing system includes a 20 channel call keypad transmitter, and 20 pickup discs. Twenty different codes can be sent through a combination of numbers 1‑20. Greatly improves efficiency and avoids customers waiting in long queues. 2、Multifunction: Low power mile indicator, charging indicator, learning code registration mode, online lookup, vibration, sound, light flashing, switchable prompts at will, maximum support 20 discs. 3、Professional Processing Chip: Using imported processing chipset, high performance noise reduction coding and decoding circuit, fast heat dissipation, strong stability. 4、Long Distance Work: External antenna receiving distance of 50‑100 meters across the wall, open area working distance of about 1000 meters (3280 feet). 5、Applicability: Widely used in fast food restaurants, food courts, pizzerias, churches and car stores or other places where many guests are waiting to be served. Item Type: Wireless Calling System Product Material: ABS Keyboard Transmitter: Operating Frequency: 433.92MHZ Operating Current: 200±30mA Standby Current: 60±10mA Coding Mode: Learning Code Working Temperature: -10℃-60℃ Disc Receiver: Operating Frequency: 433.92MHZ Standby Current: <14±3mA Operating Current: 70±20mA (Buzzer) 100±20mA (Vibration) 120±20mA (Vibration, Buzzer) Receiving Sensitivity: -107±2dBm Battery Type: Lithium Battery Single Receiver Battery Capacity: 300mAh (Included) Decoding Mode: Learning Code 1 x Keyboard Transmitter 20 x Disc Receiver 1 x User Manual 1 x Adapter