1、MULTIPLE PROMPTING METHODS: This wireless call system is equipped with multiple prompting methods, such as vibration, sound, light flashing, etc., which can improve work efficiency. 2、ADVANCED TECHNOLOGY: Adopting imported processing chipset and noise reduction coding and decoding circuit which can ensure the reliability and stability of the system. 3、LARGE RANGE COVERAGE: The host has an external antenna. The reception distance across the wall can be up to 50‑100 meters, and the working distance in the open area is about 1000 meters, which can meet the use requirements of different places. 4、EASY CHARGING: The keyboard transmitter is powered by DC5V, and the receiver is equipped with a 200mAh lithium battery with a charging voltage of DC5V. It is easy to operate and has a long usage time. 5、MULTI LOCATION APPLICATION: This wireless call system is suitable for fast food restaurants, food courts, churches and other places where there are guests waiting for service. Item Type: Wireless Calling System Material: ABS Keyboard Transmitter: Operating Voltage: DC5V Operating Frequency: 433.92MHz Operating Current: 200±30mA Standby Current: 60±10mA Coding Mode: Learning Code Receiver: Operating Frequency: 433.92MHz Battery Type: Lithium Battery Single Receiver Battery Capacity: 200mAh (Built In) Charging Voltage: DC5V Operating Current: 75±10mA (Vibration) Standby Current: 10±5mA Receiving Sensitivity: -107±2dBm Decoding Mode: Learning Code 1 x Transmitter 10 x Receiver 1 x Receiver Power Adapter 1 x Transmitter Power Adapter 1 x Charging Dock 1 x Instruction Manual