End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://lono.farafile.ir/file/40717/پاورپوینت-شرایط-فیزیکی-و-روانی-محیط-کار-و-اصول-ارگونومی