Sony TDG-BT500A Operating Instructions Manual page 5

Overview
Active 3D glasses needs registration to TV.
When using Active 3D glasses with another TV, re-registration is necessary.
TV and Active 3D Glasses
communication range
The preferred viewing position needs to be
kept within the proper range. See the
TV
following chart.
The recommended minimum viewing
Overhead view
distance is 3 times the screen height.
GB
The working distance depends on obstacles
(person, metal, walls, etc.) or
electromagnetic waves.
120°
Side view
45°
30°
GB
5