1、3 Alert modes: This paging system has 3 reminder modes, vibration, beep and flash. When there is background music, the vibration and flashing mode can be selected to better notify the customer. 2、Long Range Transmission: Built with advanced FM technology, the pager's working distance can is 2625 feet, allowing customers to wait in open spaces or in their cars. 3、Call Record Checking: This beeper system enables you to see the last 10 calls, you know which customer missed a call, ensuring nobody is overlooked. 4、Long Standby Time: Equipped with a built in 200mAh rechargeable battery, the cafe pager system can standby for as long as 20 hours, ideal for long hours of working without the need for frequent recharging. 5、Convenient and Stable Charging: This restaurant pagers feature an enlarged size and stable charging dock, making charging easier and more reliable, reducing dropping and damage. Item Type: Restaurant Pager Buzzer System Main Unit: Input Power: DC12V/2A Transmission Frequency: 433MHz Transmission Distance: Approx. 800m / 2625ft Charging Sub Units Number: 20 Connectable Sub Units Number: 998 Key Mode: Touch Sensitive Keys Sub Unit: Reception Frequency: 433MHz Reception Sensitivity: -108dBm Transmission Distance: Approx. 800m / 2625ft Standby Time: 20 Hours Reminding Methods: Vibration, Beep, Flashing Light Reminding Duration: 1-999 Seconds Adjustable Single Sub Unit Battery Type: Built in 200mAh Lithium Polymer Battery (Included) 1 x Main Unit 20 x Sub Unit 1 x Adapter 1 x User Manual