https://powertraveller.com/iwantsome/arrivingsoon/silverback/#A little pricey at $450
1. Input: AC 80~240V, 50~60Hz
2. Output: USB (5V) 600mA, 8.4V, 9.5V, 12V, 16V, 19V, 24V, AC 110V 50~60Hz
3. Output Power: 250 watt
4. LCD display, battery level, output voltage, input status
5. USB permanent output, supports Apple iPhone etc and mobile phones
6. Output auto-off if without load in 2 minutes
7. Response time <10ms when AC input off
8. size: 243 mm x 203 mm x 33 mm
9. Input socket: Figure 8
10. Output socket: world wide compatible extension lead
11. Alarm sound when AC input off ( optional)
12. Capacity 60,000 mAh
13. Estimated weight 2.5kg