1、RF Wireless Technology: This wireless caregiver pager calling system adopts RF wireless technology, which is responsive, easy to operate and suitable for various places. 2、IPX7 Waterproof: This wireless restaurant service calling system is IPX7 Waterproof, which can be used in a variety of environments and can guarantee long time use. 3、Flexible Application: This wireless guest customer service calling system has 4 channels and supports 5 buttons, which can be freely combined and flexibly applied. 4、Excellent ABS Material: This restaurant pager system is made of excellent ABS material, which is sturdy and durable, not easy to be damaged, and has a long service life. 5、Wide Application: This wireless calling system has a wide range of applications and can be used in homes, factories, hospitals and other places to guard elderly care and emergency calls. Item Type: Wireless Restaurant Pager System Working Frequency: 433.92MHz Charging Voltage: DC5V Battery Type: Lithium Battery Battery Capacity: 300mAh (Included) Operating Current: 100 ± 20mA (Vibration and Buzzer Mode), 75 ± 10mA (Vibration Mode) Standby Current: 10 ± 5mA Receiver Sensitivity: -107 ± 2dBm Decoding: Learning Code Waterproof Level: IPX7 Working Temperature: -20℃-60℃ Button Transmitter: Working Frequency: 433.92MHz Size: Approx. 60 x 60 x 13mm / 2.36 x 2.36 x 0.51in Battery Type: CR2032 x 2 Single Button Lithium Battery Capacity: 240mAh (Included) Transmitting Current: 10mA ± 3mA Standby Current: <1uA Open Distance: >100m Button Presses: 1,000,000 Times Waterproof Level: IPX4 Working Temperature: -20℃-55℃ Single Key: CALL 1 x Receiver 2 x Transmitters 1 x Charging Cable 1 x Manual