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- Roomba j7 j7156 vs X21 SW
iRobot Roomba j7 j7156 vs Medion X21 SW
What Roomba j7 j7156 does better (1) and where X21 SW wins (2) — every spec side by side.
vs
3.5Base station5.4
Why is Roomba j7 j7156 better than X21 SW?
- Dustbin (robot)400 ml vs 250 ml+60%
Why is X21 SW better than Roomba j7 j7156?
- Base stationCharging dock vs Auto-empty dock
- Charging time360 min vs 300 min+20%
Specifications
Side by side
| Suction & cleaning | ||
| Suction power | — | 3,000 Pa |
| Dustbin (robot) | 400 ml | 250 ml |
| Main brush | — | Single main brush |
| Side brushes | — | 2 |
| Carpet detection | — | Yes |
| HEPA filter | — | Yes |
| Noise level | — | 68 dB |
| Navigation & obstacles | ||
| Navigation | — | Laser (LiDAR) |
| Navigation sensors | — | LiDAR laser (LDS), Wall sensor, Cliff sensors |
| Obstacle avoidance | — | Basic sensors (infrared / bumper) |
| Threshold climbing | — | 18 mm |
| No-go zones / virtual walls | — | Yes |
| Room mapping & room selection | — | Yes |
| Mopping | ||
| Mop type | — | Mop pad |
| Water tank (robot) | — | 250 ml |
| Base station | ||
| Base station | Charging dock | Auto-empty dock |
| Auto-empty dust station | — | Yes |
| Dust bag (dock) | — | 2.5 l |
| Battery & runtime | ||
| Battery capacity | — | 3,200 mAh |
| Runtime | — | 150 min |
| Charging time | 360 min | 300 min |
| Cleaning area per charge | — | 120 m² |
| Size & weight | ||
| Width / diameter | — | 320 mm |
| Length | — | 320 mm |
| Height | — | 93 mm |
| Weight | — | 3 kg |
| Shape | Round | Round |
| Colours | Grey | White, Silver |
| App & smart home | ||
| App control | Yes | Yes |
| Voice assistants | Amazon Alexa, Google Assistant | Amazon Alexa |
