OPTIMIZED NAVIGATION mode: DEEBOT 601 employs a more thorough, systematic wall-to-wall cleaning path when vacuuming hard floors to clean better and faster.UP TO 120 MIN runtime with auto-return and charge to clean more and always be ready.ANTI-DROP (STAIRS SAFETY) & anti-collision sensors to protect your furniture and prevent DEEBOT from falling downstairs.LOW SOUND LEVEL to protect your home activities and pets.SMART HOME: use Amazon Alexa & Google Assistant voice commands to start or stop cleaning, and to return to charging station.ECOVACS Home App: customize, schedule & track cleaning sessions, monitor accessory status & receive notifications.