Sony TH-M508 - Manual (Page 10)

Description of parts and controls
7
Remote control Putting batteries in the remote control
If the range or effectiveness of the remote control decreases,
replace both batteries.
CAUTION
• Do not expose batteries to heat or flame.
Operating the system from the remote
control
Aim the remote control directly to the front panel of the center unit.
• Do not hide the remote sensor.