Features: Three different reminding methods: vibration; vibration + buzzer; buzzer; each reminder mode is accompanied by flashing. Stop button at the bottom of the buzzer, which can be used to stop reminding, and it can also be used to turn on and off a single buzzer. 50-100 Meters Connection Distance.The actual distance is affected by the nearby environment. Convenient for Guests. They can rest in the empty space after ordering, no need to wait in line at the bar. Suitable for places where there are many guests waiting for service, such as restaurant, hospital. Specifications: Material:ABS Plug:AU Standard / EU Standard / UK Standard / US Standard Keyboard Transmitter Size: Approx. 14.5 x 10.5 x 7 for cm / 5.71 x 4.13 x 2.76 inches Working Voltage: DC12V Working Frequency: 315MHZ/433.92MHZ Working Current: ≤ 260mA ± mA Standby Current: <50mA±10mA Coding Method: Learning Code Disc Receiver Color: Red Size: Approx. 7.8 x 1.5 for cm / 3.07 x 0.59 inches Working Voltage: DC3.7V (rechargeable battery) Charging Voltage: DC5V 4A Working Frequency: 315MHZ/433.92MHZ Working Current: 130±20mA Standby Current: <12mA±3mA Decoding Method: Learning Code Battery Capacity: 360mAh Package Includes: 1 Piece Transmitter 10 Pieces Receivers 1 Piece Charger note: Please allow 1-2cm errors due to manual measurement. Because of the different display of each computer, the pictures may not reflect the actual color of the item.