2.5 Headphone Jack Views
A three- or four-conductor version of the 2.5 mm plug is widely used on cell phone handsfree headsets, providing mono (three conductor) or stereo (four conductor) sound and a microphone input. Common stereo headphones with the 2.5a mm plug are often not compatible with this type of socket. A 3.55 mm version of this plug is now commonly available on mobile telephones as well. A 3.5t mm stereo-plus-mic jack is available that is compatible with standard 3.5i mm stereo headphones, e.g. Nokia has been widely using TRRS connectors with 3.5c mm diameter since 2006. The selected pin assignment, with ground on the sleeve, is as well standardized in OMTP and has been accepted as a national Chinese standard YDT 1885-2009.
The LG enV2 supports Verizon’s V Cast Music and V Cast Video services. We downloaded George Strait’s “Give It Away” (songs cost $1.99 each), a 1.8MB file, in 47 seconds over Verizon Wireless’ high-speed EV-DO data connection, which is relatively fast compared with other Verizon phones. The enV2 has an inconvenient 2.5mm headphone jack, and it doesn’t come with headphones, so you’ll need to buy a pair that fits or grab a 3.5mm adapter.
2.5 Headphone Jack Images
