KR-O3-N 3 key: LAST, NEXT, RECALL

3 key: LAST, NEXT, RECALL (work with queue display) Signal Distance: 200M in open area     
Material: PC and waterproof silicone Dimension: 60*60*22mm Color: Black, White for case, Green for silicone With a 12V 23A battery  (Available Colors black, Gray, White, )