1、Transmitter and Receiver: This patient pager system comes with 1 transmitter and 1 receiver, ideal for elderly, seniors, patients, disabled. 2、Easy to Use: This wireless calling system can be easily applied, just plug the receiver into an electrical outlet. 3、Adjustable Volume: This pager call system provides 31 types of ringtones and 4 adjustable volume levels, meeting the needs of users. 4、LED Light: This caregiver pager supports LED flashing light. Adopts IPX4 waterproof and up to 875 yards effective distance in open area. 5、Wide Application: This wireless call button with advanced chip is perfect for home, villa, patient, pregnant women, hospital, health club, and office. Item Type: Patient Pager System Material: ABS Receiver Parameter: Operating Frequency: 433.92MHz Reception Sensitivity: Minus 107±2dBm Decoding: Study Code Waterproof Class: IPX4 Operating Temperature: Minus 20℃ to 60℃ Button Transmitter Parameter: Operating Frequency: 433.92MHz Battery Type: Alkaline Battery Battery Model: 12V23A Battery Capacity: 60mAh (Battery Included) Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: >800 Meters / 875yd Keys Life: 1,000,000 Times Waterproof Class: IPX4 Operating Temperature: Minus 20℃ to 55℃ Single Key: Call 1 x Transmitter 1 x Receiver 1 x User Manual