IBM ThinkPad Z61 Supplementary Manual page 79

Features
v Infrared port
v RJ11 telephone connector
v RJ45 Ethernet connector
™
v Ultrabay Enhanced (on some models)
v Ultrabay Slim (on some models)
v Docking connector
v Integrated wireless LAN feature (on some models)
v Integrated Bluetooth feature (on some models)
v Integrated wireless WAN feature (on some models)
v External-monitor connector
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Appendix C. Overview of your ThinkPad computer