PC battery: 1000mAh (lithium battery) LCD: 4.3-inch TFT screen, 480×272 pixels Camera: 1MPDual-mode wake-up, two-way intercom, low latency External antenna design, long range, and anti-interference Press the doorbell button to view real-time video on the screen One-touch answering on the indoor unit allows for voice intercom with visitors at the door Supports infrared night vision, allowing for clear visibility of visitors at the door day and night One-touch photo/video recording for complete control of the door situation The indoor unit features four ringtones with adjustable volume. Volume/brightness can be adjusted with shortcut keys, eliminating tedious setup. External industrial-grade antenna with a transmission range of 300 meters in open air and 50 meters indoors (through walls). TF card support up to 256GB (not included). Energy-saving design: The outdoor unit lasts approximately 6 months on a single charge