Specification: Item Type: Caregiver Pager Material: ABS Wireless Reception Distance: Approx. 330m / 1082.68ft at open space. Wireless Frequency: 433MHZ Method: One to one. Built In Polymer Lithium Battery: 1 x 1000mAh for receiver, 1 x 23A battery 60mAh for transmitter. Package List: 1 x Receiver 1 x Button 1 x Charging Cable 1 x User Manual [QUICK CALLING] When there is an emergency, just push the call button, and the alert message will immediately send to the receiver. [STABLE SIGNAL] The working range can get up to 330 meters in an open area, making sure that you will never lose a call in the night. [ALERTING MODE] Has 38 pieces of music and 4 level volume adjustment, also enables free matching between transmitter and receiver. [EXTENSIVE USE] Can be widely applied in home, nursing home, hospital and so on, suits perfectly for the elderly, patient, etc. [EASY CARRYING] Comes with a lightweight and a compact size as well, ideal for both indoor and outdoor, safeguarding the safety. [QUICK CALLING] When there is an emergency, just push the call button, and the alert message will immediately send to the receiver. [STABLE SIGNAL] The working range can get up to 330 meters in an open area, making sure that you will never lose a call in the night. [ALERTING MODE] Has 38 pieces of music and 4 level volume adjustment, also enables free matching between transmitter and receiver. [EXTENSIVE USE] Can be widely applied in home, nursing home, hospital and so on, suits perfectly for the elderly, patient, etc. [EASY CARRYING] Comes with a lightweight and a compact size as well, ideal for both indoor and outdoor, safeguarding the safety.