Description :  KERUI F66 Wireless Transmitter 4 Keys Button for Restaurant Hopital Hotel Call Waiter System 433MHz   Specification :  Wireless Coding: PT1527、 EV2262 Working Frequency: 433MHz Wireless distance: 100M in Open Area 4 buttons: CALL、 CHECKOUT、 CANCEL、 WATER Size: 62 x 64 x 28mm  Package includeds :  1 x KERUI F66 4 Keys Button   Details pictures :