Features: Telephone Test Set with Butt In Jumper ensures clear communication through detection technology and precise line analysis for troubleshooting. Featuring ABS shock resistant housing, this testing equipment withstands daily wear while maintaining structural integrity in demanding work environments. Designed for engineers and field technicians requiring maintenance tools across multi brand telephone. Optimizes workflow during networking installations, compatibility checks, and repair in commercial or industrial settings. Its compact form factor integrates easy butt in jumper connectivity with lightweight portability, streamlining complex telecommunication infrastructure diagnostics. Specifications: Component:ABS Type:B/A/C Size:Approx.125x50x25mm Package Includes: 1 Set Telephone Test Machine note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.