Features: 1.Multi Function: The transmitter and receiver can be paired arbitrarily, there are 38 songs to choose from, 4 gear volume adjustment. 2.Wide Purpose: This pager is suitable for patients, the elderly, pregnant women, children to call for help, no need to shout to attract attention. 3.Long Wireless Distance: Using 433MHZ wireless frequency, the receiver can receive signals as far as 330m in open space, 50m through wall, regardless of horizontal or vertical distance. 4.IP55 Waterproof: The transmitter call button is IP55 waterproof, suitable for restaurants, toilets, etc., not afraid of getting wet. 5.Compact and Portable: The call button is easy to carry and can be carried in pocket or hung around the neck with a sling, or can be installed by the bed. specification:Item Type: Caregiver Pager Material: ABS Wireless Reception Distance: Approx. 330m/1082.7ft (Open Space) Wireless Frequency: 433MHZ Method: One to One Remote Control Built in Battery: 1 x 23A Alkaline Battery 60mAh Voltage: 100-240V PackageList: 1 x Receiver 1 x Call Button 1 x Manual