... rest Functional Wireless Calling System(KQ-41C+KQ500-3M) with Watch Pager,Three Key Button Assignment Receiver Specification :1.Wireless request ... calling system can be used in restaurants, hotels, hospitals, tea house, coffee shops, health clubs, beauty salon, spa center, bars, swimming ... quickly. Functional Wireless Calling System(KQ-41C+KQ500-3M) with Watch Pager,Three Key Button Assignment