... timely.Specification of display receiver K-55:1. Wireless Ordering system for waiter receiver vase and service button combined ... ≤20mWTransmitted Distance>300m in open area Picture of Wireless Ordering SystemDelivery time:sample or small order within 3 days ... T/T, Western union, Paypal, EscrowWarranty: 1 year FAQApplicationsWireless Ordering can be used in restaurants, hotels, hospitals, tea house, ...