The product (phone Siemens Gigaset AS28H trio) is excellent. But the instructions supplied with the product is lamentable fate that I had the greatest difficulty in installing phones, so that the operation could have been made in 15 minutes with good instructions. The main problem was that the record does not say what is "basic" and then if we confuse basis (there is only one for all devices) and base (there is one per unit) it happens to use a single device. I found the solution through a forum, or a user has given the explanations he had a large number of users who, like me, were floundering. The notice has other defects, less irritating, but annoying nonetheless. I do not understand that a manufacturer, which is also excellent products and its image abyss with a notice as badly done as often unclear and also tiring for the eyes, because too little written.