A. Function features: 1. With MPU technology and digitalauto-control, TFT3.5 inch digital color display, capability and better reliability. 2. Wireless doorbell functions and calendar function all can be chose. 3. Doorbell: Remote control functions can be chose, such as 24-hour monitoring, call, talk, unlock features and so on. 4. Clock calendar functions can be set up year, month, day, hours, minutes. 5. Large-capacity rechargeable battery 6. Remote control distance: About 100-150 meters(no obstacle) 7. 2.4G emission frequency (international standard), emission no more than 17 dbm 8. One outdoor phone can remote control many phones, but one indoor phone can link many outdoor phones 9. Crust is made by ABC, beautiful appearance 10. Hanging and desk-top optional B. Pay attention to matters: 1. Please read the installation method Manual 2. The door phone-no rain, light 3. Should be pulled out of indoor antenna, the reorientation can affect speaking voice