Samsung SM-J600F User Manual page 11

Basics
When using the speakers, such as when playing media files or using speakerphone,
do not place the device close to your ears.
Connectivity problems and battery drain may occur in the following situations:
– If you attach metallic stickers on the antenna area of the device
– If you attach a device cover made with metallic material to the device
– If you cover the device's antenna area with your hands or other objects while
using certain features, such as calls or the mobile data connection
Using a Samsung-approved screen protector is recommended. Unapproved screen
protectors may cause the sensors to malfunction.
Do not cover the proximity sensor area with screen accessories, such as a screen
protector or stickers. Doing so may cause the sensor to malfunction.
Do not allow water to contact the touchscreen. The touchscreen may malfunction
in humid conditions or when exposed to water.
Hard keys
Key
Power
Volume
Volume key
Function
Press and hold to turn the device on or off.
Press to turn on or lock the screen.
Press to adjust the device volume.
11
Power key