Switchable alarm modes; Retekess TD157 restaurant buzzer has 2 alarm modes; flash + buzzer; flash only; but no vibration mode; you can switch the mode you needCan share the buzzers with retekess TD157S; if you have a strong demand for vibration mode; you can buy it together with pager system for TD157S; the beepers of the two products can be shared; meet your diversified functions of vibration + flash + buzzer on two hosts at the same timeEasy to set up and program; Retekess TD157 restaurant pager system no need to reprogram; the dining car restaurant pager buzzer is easy to use out of the boxLong standby time; Retekess TD157 restaurant pager system can work for 20 hours after charging; avoid the trouble of frequent battery replacement; meet the needs of long-term useAdjustable reminder time; the food ready buzzer can set the buzzer duration to 1-99 seconds; the restaurant pager will not keep beepingLong working distance; Retekess TD157 food truck order beepers work distance up to 984ft-1640ft in open areas;can keep customers waiting in the carAdditional pagers can be added to the system; supports up to 998 If your business grows;you can add more pagers