1). RF wireless technology; 2). Fashionable watch design; 3). Dot matrix LCD screen 4).Up to 500 channels; 5). Call button data pin support for custom; 6). Call button words selectable 7). Single or list display mode; 8). Accurate time display; 9). Vibration/Buzzer prompt 10). Low-power indication; 11). Built-in removable rechargeable battery CTW06 watch pager Technical Data: 1).Capacity:500 pcs of pager transmitters 2).Alert Mode:vibration,ring or flash 3).Receive Sensitivity:-110dbm 4).Storage:20 calling numbers(for queuing) 5).power supply mode:250mAh lithium battery 6). Standby Time: (in ideal conditions) 7).Frequency:433.92MHZ 8).Compatible with 1, 2, 3, 4, 5 buttons How we use the wireless restaurant calling system:First, the calling buttons are pasted or put or on the table, when the guest have any service, he or she press the calling buttons, the receiver (LED screen or watch pager) will get signal with vibration or sound, showing the table number, then the waiter will know which table to be served. Modulation Mode:ASK (AM) RF Frequency:433.92MHz Working Chip:Learning Code Power Supply:CR2032 Cell Battery (included) Transmission Distance:Up To 100 Meters (in open area) Working Temperature:-20 to 55 Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Button Colour: A: Black+Red Colour:Photo Color Material:ABS Package Contents: 5 x call buttons 1 x watch receiver Pager Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.