Radiodetection RF Marker Ball – Telecoms / Phone (Orange) The Radiodetection RF Marker Ball – Telecoms / Phone is a passive underground marker used to clearly identify buried telecommunications and telephone infrastructure. RF marker balls are passive, frequency-tuned markers that resonate when energized by a locator signal, enabling accurate underground utility identification without power or maintenance. Once installed, it can be reliably detected using compatible Radiodetection marker ball locators, including the MRX SG, MRX G, and MRX. Its orange color coding ensures fast visual and electronic identification during future locating operations. Utility Type: Telecoms / Phone Color: Orange Part Number: 61/OMTEL-MK2 Packaging: Box of 30