1. 1/4" Sharp CCD, 420 TV lines ,tiny size, 2. WiFi, 4 Channel 3. Built-in micropone 4. Children and elders monitoring. Specification:*1/4"CCD, 420TV lines sharp picture display*Tiny in Size for discreet observation & portability*Built-in micropone for audio monitoring*Min 100m transmission distance without block*Children and elders monitoring, theft prevention,etc.