This is a retro mobile phone receiver that allows you to be more comfortable when answering calls. More suitable for people who communicate on the phone for a long time The Telephone Handset provides here, Color: Matte Black; Handset Size:21*6.2*6.7cm/8.27*2.44*2.64L*W*H) This phone handset has an answer button and a volume button, you can adjust it according to your needs,wireless you can easily answer calls Steps of installation: 1. Connect the mobile phone adapter on the mobile phone 2. Press the answer key when have call before purchasing, please confirm the size