The / automatic identification and display feature of this telephone tester is a standout feature that ensures users never miss important calls. This tester provides accurate and reliable call information. Its simple and elegant design makes it a great addition to any home or office. Features -Color:Black -Material:PVC -Size:13.00X5.00X2.00cm/5.11X1.97X0.79in -Automatic identification and display of / incoming call information - maximum 8 bit 57 groups, 12 bit 44 groups - maximum 8 bit 65 groups, 12 bit 49 groups -Clear display: The / automatic identification and display feature ensures that users never miss important calls -Elegant design: The simple and elegant design of the phone complements any decor -Easy-to-use design: This phone has an easy-to-use interface for personal and professional use -Reliable to use: The call information provided by the phone is reliable and accurate -Good stability: The id telephone tester is practical and reliable, with good stability, and will be your good choice Package list: 1 1 x replacement line 1 x instruction manual