Lenovo ThinkPad T420 (English) User Guide - Page 24
Dock Series 3 and ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 170 W - ultrabay
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For details, refer to the instructions in "Using the media card reader" on page 79. 5 Media card reader slot Depending on the model, your computer may have a media card reader slot. The media card reader supports the following cards: • SD card • SDHC card • SDXC card • MultiMediaCard Note: Your computer does not support CPRM feature for SD card. For details, refer to the instructions in "Using the media card reader" on page 79. 6 Wireless radio switch You can quickly turn the wireless features of your computer on and off using this switch. 7 Serial Ultrabay enhanced Your computer has a bay for serial Ultrabay™ enhanced devices. An optical drive is installed in the bay. Note: You can install a 9.5-mm-thick serial Ultrabay slim or a 12.7-mm-thick serial Ultrabay enhanced device in the serial Ultrabay enhanced. 8 Combo audio jack To listen to the sound from your computer, connect a headphone or a headset that has a 3.5mm 4-pole plug, to the combo audio jack. Notes: • If you are using a headset with a function switch, for example, a headset for an iPhone® mobile digital device, do not press this switch while using the headset. If you press it, the headset microphone will be disabled, and the internal microphone will be enabled instead. • The combo audio jack does not support a conventional microphone. For more information about the audio devices supported by the combo audio jack of your computer and the audio jacks of ThinkPad Mini Dock Series 3 and ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 (170 W), see "Using audio features" on page 77. 6 User Guide