Features: 1. Thin design, more compact and lightweight 2. There are two ways to charge each menu: using a charger dock or charging directly 3. Each system can expand up to 999 menu options 4. Portable rechargeable vibration and buzzer pager 5. Independent storage to avoid data loss 6. High receiving sensitivity 7. When the pager makes a call, the LED light flashes 8. One charger base can charge up to 10 coasters and pagers simultaneously 9. Equipped with a power button that can directly turn off the power of each pager 10. When charging, press and hold the 9 button on the keyboard to turn off all pagers Specifications: Pick up the menu Size 71 * 68 * 13mm Net weight 42g High quality PC material Frequency 433MHz Screen display number 001-999 The power supply is equipped with a 400mAh lithium battery Charging time of 3 hours 3 prompt modes: vibration/buzzer/vibration+buzzer Keyboard transmitter Size 153 * 113 * 53mm Weight 166g Critical lifespan of millions or more Working current 200mA Standby current 40mA Frequency 433MHz Power supply DC 5V 1A