Samsung A3LSMJ260MU Manual page 11

Basic
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.
Power key
1