Function: 1. Multifunctional: transmitter and receiver can be paired freely, there are 38 songs to choose from, 4 gears volume control. 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 the 433MHz wireless frequency, the receiver can receive signals up to 330m in open space, 50m through a 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 a pocket or hung around the neck with a sling or installed at the bedside. Specification: Item Type: Guardian Pager Material: ABS Wireless reception distance: approx. 330 m / 1082.7 ft (open area) Wireless frequency: 433MHZ Method: One to one Remote control Built-in battery: 1 x 23A 60mAh alkaline battery Voltage: 100-240V How to use: Plug and play. Package List: 1 x receiver 1 x call button 1 x Manual