Features: 1. 20 Channels - A 20 channels base and 20 pieces of pagers help avoid the waiting of the client in the long queue to a great extent. 2. 20 Charging Slots - Pager can be placed in the base to charge when it's free. 3. 1km Connection Distance - A built-in antenna enables pager to work normally within 1km from the base. 4. 3 Indication Modes - Adopting 3 indication modes of vibration, bee cue, and vibration plus bee cue to make it suitable for different situations. 5. -107dBm High Sensitivity - High sensitivity enables base to call pagers clearly and correctly. 6. Wide Compatibility - Suitable for places where there are many guests waiting for service. Specification: Product type: Wireless Queue Calling System Channel: 20 channels Indication mode: Vibration, bee cue, vibration plus bee cue Receiver: Working frequency: 433.92MHZ Standby current: 10±10mA Working current: 75±10mA (vibration) Receive sensitivity: -107±2dBm Battery capacity: 200mAh Decoder: Learning Code (AM) Size: about 49*101*11mm/1.93*3.98*0.43in 20-way Keyboard Host: Working frequency: 433.92MHz Standby current: 24±5mA Transmit current: 100±30mA Encoder: Learning Code (AM) Size: about 150*300*33mm/5.91*11.81*1.3in Package List: 1 * 20 Channels Main Engine 20 * Receivers 1 * Antenna 1 * Power Adapter .