Goods at a good price, reasonable delivery time. Unfortunately, a non-standard communication module was installed in the inverters, which does not support the standard applications for this group of inverters (Watch Power). Instead, it forces users to install the Smart life app - but this is unusable and falls far short of the utility value of the original Watch Power. Yet before ordering I requested the manual - it states that the inverter works on Watch Power. But included in the delivery was an addendum to the manual that encourages Smart life. And because of this, the utility value of the inverter is reduced to just a "black box". Very disappointing... I guess I'll have to accept that Watch Power or Smart ESS won't work... sad...