SCOPE OF USE: Telephone cord detanglers applies to family or office fixed-line telephones which work with standard RJ9 telephone line, 4P4C gague handset coiled cord. But NOT suitable for VOIP phone and RJ45 modular plug. 360 ROTATABLE ANTI-TANGLE CORD: The Phone Cord Detangler with high-quality materials and gold-plated metal contacts automatically rotates 360 degrees to effectively prevent your coiled phone cord from being tangled and messed up, and you would not feel frustrated with entangled cord. HANDSET CORD: 1 Feet/30cm Long Coiled Up to 10 feet/300cm Uncoiled. Twisted cable with two crystal head and modular plug on both ends. EASY TO USE: Simply snap the detangler between the telephone handset and the cord. Removal of the detangler is just as easy. PACKAGE INCLUDE: 2 x Telephone Handset Cords, 2 x Cord Detanglers.