Feature:1. Using radio frequency wireless technology, the system is stable and the wireless receiving distance is long.2. Fashionable appearance and novel design, display time, year, month and day, support 400 pagers, support single-button or 4-button pagers.3. Call button word selectable, accurate time display and 30level digital control volume adjustable.4. Can name the call button starting with ABCDEF, and use advanced microprocessing chip to make its performance stable and reliable.5. Widely used in various places such as homes, hotels, bars, restaurants, factories, workshops, tea houses and offices.Specification:Item Type: Wireless Calling SystemDisplay Receiver Parameter Description: Model: SU-620Operating Frequency: 433.92MHzMaterial: ABSWorking Voltage: DC5VWorking Current: 100mA10mAReceiving Sensitivity: 105dBmDecoding: Learning the codeWaterproof Rating: IPX4Working Temperature: -20~ 60Button Transmitter Parameter Description: Model: SU-A01Operating Frequency: 433.92MHzBattery Model: 23A12VBattery Capacity: 60mahEmission Current: 10mA3mAStandby Current: <1uAOpen Distance: >500mKeys: 1 million timesWaterproof Rating: IPX4Working Temperature: -20~ 60One Touch: CallHow to Use: Button Function Description: Function Key: FUNConfirm Key: ENTDown Button: DOWNLeft and Right Buttons: MOVEUp Key: UPThe Function Options Are Described As Follows: F1-1: Add pager optionsF1-2: Delete pager optionF2-1: Add remote control optionF2-2: Delete remote control optionF3-1: Cycle number option is 0 to display when calling, other numbers (1-15) represent the number of recent calls.F3-2: Last stay display time 1-99 secondsF3-3: Cycle interval time 1-99 secondsF3-4: Model Reporting OptionF4-1: Single-key and multi-key options 1 is single-key, 4 is multi-keyF5-1: Volume adjustment options 0-30F5-2: Prompt tone option 0-2F5-3: Number of reports 1-9F6-1: Delete all pagersF6-2: Restore factory settings (and delete all pagers)F7-1: Time setting.Package List:1 x Display1 x User Manual 1 x Power 30 x Transmitter30 x Sticker