Queue Wireless Calling System For Restaurant/coffee Shop. FEATURES: A 20 Channels Base and 20 Pieces of Pagers Help Avoid the Waiting of the Client in the Long Queue to a Great Extent. 1km Connection Distance A Built-in Antenna Enables Pager to Work Normally Within 1km from the Base. Adopting 3 Indication Modes of Vibration, Bee Cue, and Vibration Plus Bee Cue. 107dBm High Sensitivity - High Sensitivity Enables Base to Call Pagers Clearly and Correctly. Wide Compatibility - Suitable for Places Where There Are Many Guests Waiting for Service. SPECIFICATIONS: Item Type: Wireless Queue Calling System Channel: 20 Channels Indication Mode: Vibration, Bee Cue, Vibration Plus Bee Cue Receiver: Working Voltage: DC3.7V (rechargeable Battery) Charging Voltage: DC5V Working Frequency: 433.92MHZ Standby Current: 10±10mA Working Current: 75±10mA (vibration) Receive Sensitivity: -107±2dBm Battery Capacity: 360mAh Decoder: Learning Code (AM) Size: About 49*101*11mm/1.93*3.98*0.43in INCLUDES: 1 * 20 Channels Main Engine 20 * Receivers 1 * Antenna 1 * Power Adapter . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.