Model: to RJ11. Fits all standard residential modular phones (fits RJ11 ). Extension cord with a panel end and modular female connector on the other end. It's just take you 1 minute. Material: Pure Copper Cord+PVC Cover.
eBay
ZoeRax Network Ethernet Cable Tester for LAN RJ45 Cat5 Cat5e Cat6 Cat6a Cat7 UTP/Shielded Cable and RJ11 RJ12
Aliexpress UK
10M BT MALE TO FEMALE EXTENSION CABLE/TELEPHONE FAX MODEM EXTENSION LEAD ITEM DESCRIPTION Telephone Extension Cable for the standard British Telecom phone systems. You can use it for phone, fax, answering machine, etc. The length of the cable with connector is 10 metres. Standard telephone cable with but plug and but socket 10 meter length
eBay
Gray DIY 6 Core Jumper Cable for NXT EV3 Robot Toy Data Cable Six-core telephone line RJ11 Telephone Modular Plug Jack 6P6C 6Pin
Aliexpress UK
This Telephone Extension Cable is a high-quality Dencon product that is compatible with various brands. It is a 2m long white cable with a 1:1 connexion split/duplication and RJ11 connectors on both ends. The cable is designed for use with home phones and modems, and it comes with a DSL/Phone (RJ-11) female connector on one end and a DSL/Phone (RJ-11) male connector on the other.
eBay
Cable Tracker Tester BSIDE FWT11 Network Cable Finder Telephone Wire Tracker High Quality RJ11 RJ45 Cat5 Cat6 LAN Line Finder
Aliexpress UK
BT Male to Female Extension Cable. Robust build ensures a secure connection, minimizing signal interference for a consistently strong connection. Ideal for extending the range and flexibility of your existing cables.
eBay
ANENG M469A M469A Network Cable Finder RJ45 RJ11 LAN Cable Finder Tester Anti-Interference Testing Instrument Network Repair
Aliexpress UK
In sealed bag but looks like it’s 10 m long cable.
eBay
AMPCOM Network Cable Tester, CAT5E CAT6 CAT6A CAT7 RJ45 Networking Lan Cable 8P8C POE RJ11 Telephone Line Continuity Tester
Aliexpress UK
RJ11 To RJ11 Cable ADSL Extension Lead Higher Speed Phone Cord Telephone Plug UK
eBay
ZoeRax Network Ethernet Cable Tester for LAN RJ45 Cat5 Cat5e Cat6 Cat6a Cat7 UTP/Shielded Cable and RJ11 RJ12
Aliexpress UK
Connectors Type : 6P2C US Male to UK BT Male cable. We'd like to settle any problem in a friendly manner. Because the unpaid dispute will not be closed automatically, and we may ignore it.
eBay
High Quality 1pcs Network RJ45 RJ11 Cable Crimper Wire Cut Off Impact Punch Down Tool Impact Punch Down Insert Cut Cable
Aliexpress UK
Model: to RJ11. Fits all standard residential modular phones (fits RJ11 ). It's just take you 1 minute. Extension cord with a panel end and modular female connector on the other end. This is the network panel the phone interface.
eBay
Cat5 Cat5e Cat6 Cat6a Cat7 LAN Cable Tester for LAN RJ45 RJ11 RJ12 UTP/STP Network Cable Enternet and Telephone Wires
Aliexpress UK