E. F. Johnson Company Product. LTR 8602 Duplex Mobile with 500 XT (Yupiteru) Handset. Material: metal, plastic. (a) LTR 8602 Duplex Mobile Station. Size: 6 1/2" x 9 1/4" x 2" H. Description: black plastic case, speaker attached on right side; E.F. Johnson Company logo bar attached to lower right; digital display screen on left side; black knob below screen; E.F. Johnson Company label on bottom. (b) Handset. Size: 2" x 8" x 5" H. Description: black plastic handset attached to black metal stand; push buttons: 1-9, 0, #, *, SND, FCN, END, STO, RCL, CLR; Johnson logo top above digital screen display.