Product parameters (to give you a better choice)             Product size: 57mm*57mm*15mm    Length of prompt: 01-15 duration          Net weight: about 24g    Receiving sensitivity: -114dBm          Shell material: ABS+PC    Frequency band: 433.92MHz          Surface treatment: wear-resistant UV spray paint    EMC is resistant to disturbance: strong          Product color: black    Number of pagers available: 500          Carrying mode: rope type    Number of stored messages: 10          Display screen: OLED monochrome screen    Hint mode: vibration          Number of buttons: 2    Label mode: manual, automatic          Display type: a group of 3/5 digits (with storage function)    Special function: with alarm clock, calendar, data download function          Standby time: about 3 days    Power input: DC 5V/≥200mA          The English letters are 0-9, A-Z    Battery used: 3.7V lithium battery          Battery capacity: 180mAh               Main functions and features  1. Rope design, fashionable and simple (circular appearance is simple and generous, rope design mobile receiver, easy to carry, suitable for a variety of occasions)  2. Calendar and alarm clock reminder function (calendar and alarm clock reminder function, allowing users to arrange time reasonably, easy to use, more intuitive to provide accurate services.)  3. Monochromatic OLED screen (OLED screen is adopted, which has the advantages of self-illumination, fast reaction speed, stable image, clear handwriting, earthquake resistance and fall prevention;)  4. Simple and environmentally friendly charging method  5. Registration is more convenient  The products are widely used in restaurants/hotels/clubs/bathing places/hospitals/factories, etc