Ycall 10pcs Call Button Transmitter 1-key Restaurant Pager Hookah Wireless Waiter Bell System (Only Call Button) Packing: Table Call Button ONLY Note: This is a decision transmitter button only, if you want to prefer the correct receiver that fits this button, please be happy to touch us Specification of K-H1-T name button: Single key: Call Signal Distance: 200M in open field With a CR2025 battery Material: PC with Smooth surface and water resistant silicone Dimension: 60*60*10mm one hundred pc waterproof and Ultra-thin