FunctionCall, Cancel, Pay, Order Function KeyVery easy compatible guest use, especially compatible restaurant use; you can get to know your customer detailed wants; watch pager can improve the working efficiency effectively Easy to Use: The call button is designed to be user-friendly, making it easy compatible anyone to use.Compact DesignSmall dimension, light weight and round type make the pagers come with com compatibletable grip feeling and easy to carry anywhere. Stable Signal:Calling pagers use higher working frequency with learning codeCompared with fixed code type, the signal interference can be well controlled with better signal stability.Built-in CR2016 Button BatteryThe pager posses two pcs CR2016 button batte Double Sided Tape Design:With a double sided tape, the pager can be paste on the table or wall. No need to worry about the loss of pagers. ABS Material:Watch pager adopts quality ABS material; more sturdy; it has better anti oil ability in restaurant or food truck use. Specifications: A: 4 keys Colour:Black Material:ABS Package Contents: 5 x Wireless Pager Only the above package content, other products are not included. Note: Light reflection and different displays may cause the colour of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.