Key functions of NS-3 (Self Recharge): 1. Clean the floor automatically according to on the size of your room-----by one button on the surface. 2. Protect the furniture and wall from crashing and scraping-----by Non-Marring Bumper. 3. Avoid entering the zone you don’t want to clean-----by Virtual Wall Detector. 4. Sweep floor along the wall or other obstacle-----by Wall Following Sensor. 5. Can be used on the uneven carpet, wood floor, linoleum, etc, and cross any thin barriers, such as wires, pad, etc.-----by Self-adjusting cleaning head. 6. Can be commanded to move for 4 different directions manually-----by Remote Control 7. Can do the cleaning task at a specific time you preset everyday automatically; Can be preset to automatically start work when the recharge is finished.----- by Intelligent Recharge Base. Other great features of NS-3 (Self Recharge) : 1. You can decide the time you want to clean. 2. Easy to discard the dirt by sliding out the rubbish bin. 3. With compact size and side brush, it can clean the corner efficiently 4. Look-over the surroundings automatically to avoid drop from high places. 5. Can escape automatically when blocked by the furniture. 6. Automatically search the intelligent recharge base to recharge when the battery is short.