Ringer volume controlVisual LED ring indicatorHearing aid compatible The BT Duet 210: Affordable & practical single-piece gondola phone Sporting a sleek, white appearance, the BT Duet 210 corded phone offers a range of user­friendly features including a wall­mountable design. Easy to Use The BT Duet 210 is built with practicality and ease of use in mind. It provides an adjustable ringer volume, three ringtone melodies to choose from, a mute button and compatibility with hearing aids, and when the phone rings, a bright indicator LED will also light up. Why Should You Buy this Corded Phone? Simple, reliable and very affordable, the BT Duet 210 is an ideal second phone for home or business use.