Jacob Jensen Telephone 1 The JACOB JENSEN TELEPHONE 1 is one of the smallest phones on the market today provides ease of use with the keyboard positioned under the hand set. The head set is elegantly lifted into your hand by lightly pushing on the upper part. It is equipped with 2 direct memory keys, 10 secondary memory keys, a last number redial and a mute function. 3 Ringing melodies and loudness levels The T-1 telephone has a removable base which makes it suitable for both table stand and wall mounting. The telephone has a standard plug that can be connected and used anywhere in the world.