Avaya DECT 3740/3749 wireless handsets are specifically designed for rugged production environments. These shock and scratch-proof phones with back-lit keypads, large displays and enhanced liquid and dust protection are designed to enable users to quickly make and receive phone calls (including caller ID), take advantage of hold, conferencing and messaging and get efficient access to additional Avaya Aura communication manager capabilities. Built-in speakerphone, headset compatibility and text messaging simplify communications for workers in widely distributed production locations. Communications takes place over a dedicated, encrypted wireless network. Batteries support up to 18 hours of talk time and up to 150 hours of standby time (10/80 hours on the 3749). 3749 DECT telephone has an ATEX certification (EMEA and US) so that it can be used in areas where an intrinsically safe device is required (e.g., the chemical industry, mills). Built-in sensor and alarming capabilities make these handsets a good choice for isolated or other high-risk work environments where an employe might be working alone. They can be integrated with building security systems.