... pager SU-211 and the charger SU-211A2. Where to use it?Restaurant, tea house, coffee shop, KTV, Bar ... , Club, Hospital, and any place need to wait for something in line3. What advantage of this ... restaurant service in order and run fastSave Manpower4. How to use it?When customer wait in line, you can ... you can put it on the charger to chargeuntil next time to use it. Each charger base can charge ...