A:AnswerYes. It can draw power from the handset's batteries so if your landline is working so with the phone. By swapping the other two handsets you can extend the power off life.
A:AnswerIt has a headset jack, which is why I picked this model. Note its a smaller size than the headset jack used on cell phones, but I have an adapter.
A:AnswerWe would be more than happy to look into it further. Please contact our Customer Service Team via Live Chat on the Panasonic Website, Contact Us option, Mon-Fri, 9am-5pm EST. -C