Feature: 1. Built in Battery: Built in large capacity battery for long battery life without the need for frequent charging. 2. Calling Memory: The calling record is permanently saved, and even if the power is cut off or restoring to default setting, the call record will not be lost. 3. Various Calling: Built in 33 call instructions that can be freely set to adapt to different usage scenarios. 4. Easy Operation: LCD screen display, user friendly menu operation, simple and easy to use, which will simplify the working. 5. Clear Reminding: The integration of multiple prompt methods such as vibration and ringing tones, with the function of displaying a perpetual calendar. Specification: Item Type: Wireless Wrist Pager Material: ABS Watch Receiver Parameters: Pager Connection Capacity: 500pcs Prompt: Vibration, buzzing and flashing. Receiving Sensitivity: -110dBm Calling Storage Capacity: 20 Sets Battery Type: Lithium Battery Battery Capacity: 250mAh, included. Standby Time: 7 Days Button Pager Parameters: Working Frequency 433.92MHz Battery: DC 12V Battery Type: Alkaline 23A12V battery. Single Pager Battery Capacity: 60mAh, included. Emission Current: 10mA ± 3mA Standby Current: <1uA Distance in Open Space: >200 meters Button Life: 1 Million Times Waterproof Grade: IPX4 Working Temperature: -20 ℃~55 ℃ 1 Key: Call. Package List: 1 x Watch Receiver5 x Pager1 x Charger1 x Charging Cable1 x User Manual