Feature: 1. RF Wireless Technology: RF wireless technology, stable system, long wireless receiving distance. The open distance is more than 200 meters. 2. Waterproof: Call buttons use advanced micro processing chip, which makes its performance stable, reliable and waterproof. 3. ABS Material: Wireless pager button is made of sturdy ABS material shell, wear resistant and durable, suitable for increasing the working frequency of 433.92MHz broadcast host display. 4. Simple Operation: Only need to set up the machine first, press the button of the transmitter, the receiver can receive the reminder 5. Wide Range of Applications: Widely used in homes, hotels, bars, restaurants, factories, workshops, restaurants, clubs, bowling alleys, massage rooms, churches, country clubs, health clubs, and offices and other places. Specification: Item Type: Wireless Pager Call Button Material: ABS Operating Frequency: 433.92MHz Battery : 2 Built in CR2016 Button Batteries (Included) Battery Capacity : 80mAh Emission Current: 10mA±3mA Standby Current: <1uA Open Distance: >200 Meters Keystrokes: 1 Million Times Waterproof Grade: IPX4 Working Temperature:Minus20℃ to 55℃ Four Keys: Call, Checkout, Order, Cancel. Package List: 10 x Call Buttons 10 x Film