1、INNOVATIVE DESIGN: Supports 999 receivers to effectively improve work efficiency. Support multiple prompting methods, including vibration, sound and light flash, to remind customers to pick up food in time. 2、GOOD PROCESSING CHIP: Imported processing chipset and noise reduction coding and decoding circuits are used to ensure stable system running and provide good transmission at the same time. 3、WIDE RANGE COVERAGE: The host is equipped with an external antenna, capable of realizing the reception distance of 50‑100 meters across the wall, and the working distance in the open area is about 1000 meters. 4、CONVENIENT CHARGING: The keypad transmitter is powered by DC5V and the receiver has a 200mAh lithium battery with a charging voltage of DC5V.This design makes charging very convenient. 5、MULTI PLACE APPLICATIONS: The wireless calling system is suitable for fast food restaurants, food courts, churches and other places. The use of the system can improve service efficiency, reduce waiting time and improve customer satisfaction. Item Type: Wireless Calling System Material: ABS Keypad 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 Method: Learning Code 1 x Transmitter 30 x Receiver 2 x Receiver Power Adapter 1 x Transmitter Power Adapter 3 x Charging Base 1 x Instruction Manual