3 in one :

1. With coil for voice sending ;
2. WIFI camera , very clear , ok to read letters ;
3. Invisible Earpiece included ;
   With builtin battery , just charge it , turn it on ,connect to wifi , remote monitor and talk . 

Technical data:

Video resolution: 4K / 1080p / 720p

Battery: rechargeable 1000 mA Li-ion

Battery working time: up to 4 hours

Charging: USB 5V 1A or 2A

Memory: Micro SD card up to 128 GB

Connection: WiFi

Working mode: Local AP mode 6 meters around camera / P2P worldwide

Antenna: internal

APP name: HDCameraPro

Camera size: Lens 12 x 0.8 cm, Camera body 4.5 x 3.7 x 1.8 cm, Induction coil 65 cm.

5

Diagramm :