... Main function: Talk, Unlock 3CE Features:(WIRLESS DOORBELL WITH SD MEMORY) 1) Wireless, Range:100m, energy saving ... record 200 pieces of pictures 3) Attached SD memory card4) Main function: Listening, Monitor, Auto-record ... scaled factory and have a professional team with wonderful technique.Best service, high quality, competitive ... front cover.2. This kind video door phone only one to one model3. 1.4m ...