Check the listing for details. 4 PCS DTMF decoder with LCD Display MT8870 Audio Voice Module for Mobile phone. Condition: New. Listed at 39.60 USD. Module No.: CE037*4 Product Name:4 PCS MT8870 DTMF Audio Voice decoder Display Module for telephone phone keypad show Package:(Does not include phone): 4 PCS MT8870 DTMF Voice decoding display module; 4 PCS 50cm Male to Male audio cable (3.5mmjack ); Description: Operating voltage: DC 5V Operating current: turn on the backlight 15MA; turn off the backlight 11MA Characters that can be displayed : 0123456789#*,ABCD Display number of characters: maximum 32. More than 32 characters, the screen will move the display (New character overwrites Thirty-second characters, the thirty-second characters covering the Thirty-first characters ....... the second characters covering the first character, the first character disappears). Power Interface: DC 5.5*2.1mm Audio Interface: 3.5MM audio cable Dimensions: 80x36x24 (length x width x height) Weight: 46 g