RDL TP-HA1A HEADPHONE AMPLIFIER Stereo, Format-A RJ45 In & Thru, 3.5mm jack out, volume control
Amazon.com: SHUHAN 3.5mm & 2.5mm Audio Cable CAT5 RJ45 Socket to 3.5mm 4 Pole Male Plug Audio Ethernet LAN Network Adapter, Total Length: About 13cm : Electronics
Headphone adapter for V1/ Beovision 11/12/Avant/Eclipse/Harmony/Horizon/Theatre - RJ45 Powerlink to minijack - Specialist Audio Cables for Bang & Olufsen and more
3.5mm 1/8" Male Jack TRS Audio Cable To RJ45 Socket Ethernet Adapter Wire | eBay
Headset adapter with headphone/mic plugs - Audio Cables and Adapters | StarTech.com
Amazon.com: LINESO 2Pack 3.5mm Stereo to RJ45 Female Extender Over Cat5&Cat6 Cable (2X 3.5mm to RJ45 Female) : Electronics
3.5mm 4 Pole TRRS Female to RJ45 Socket Ethernet Audio Cable 0.2m