For a limited time, we will include a mystery-free gift in consumer electronics worth £5 (in manufacturer RRP/SRP value) with this product, subject to availability and provided offer is at full retail price or no other offer involved. Please note this gift cannot be exchanged with any other product or refunded. Please note that this is an additional handset and charging cradle to be purchased for use with an existing system. This handset cannot be plugged into a telephone line, and will NOT work without a base station This is the correct handset for use with the Panasonic KX-TGM420EB, which is the latest big button home phone to be released by Panasonic and is equipped with a volume boost, which amplifies handset volume up to +40 dB. Up to 6 handsets can registered to the base of the Panasonic KX-TGM420EB range. Benefits of using multiple handsets include features such as: intercom, call transfer, conference calls, and phonebook transfer. Louder, Clear and Easy Additional amplified digital cordless phone handset: (+50 dB), tone control for clarity, easy-to-use big buttons, hearing aid compatibility and red flashing ring alert. Extra Loud Volume KX-TGMA45 is an additional handset that's designed to work with compatible Panasonic digital cordless phones* (it will not work on its own). It adds amplified speech (up to +50dB) capability to existing systems. It features an extra-loud ringer that goes up to an incredible 95 dB - up to 4x louder than our regular phones.