The product is a BT 066270 BLJ05W075030P-B 7.5V AC/DC adapter power lead specifically designed for use with BT 2500 and BT 4600 cordless phones. Manufactured in China, this black adapter is compatible with the BT brand and provides the necessary power supply for your home phone. With a voltage of 7.5V, this adapter ensures that your cordless phone remains powered and ready for use at all times.
eBay