... 1000m 2. 433Mhz, FM 3. Slim button only 8mm thickness 4. Lower value and easy buy Have ... or maintained for the first year.Buyers are only responsible for the return shipping fees for warranty ... items.In most cases, buyer will only have to return the problem components rather than ... Waiter Call Button, slim single call button,only 8mm thickness, popular in small coffee shop or ...