alpha-numeric-keypad black blank buttons communications communications-device curved edges edging fingering gadget handphone handpiece home-phone input-device lettering mobile-device mobile-phone numbers numerals numeric-keypad office-equipment portable press push-buttons screen smooth symbols telephone telephony white arrow arrows business button choice computer concept contact control data device digital hardware information input key keyboard keypad keys mark number numeric office technology typing appearance barrier closed confine confined connect connected connections contained controlled door electronic fingered fingers fixed keyless link linked links lock locked locked-door memorised memorized memory modern protect protection protective safety sealed secure secured security shut solid technological