What makes a good sound machine? That depends who you ask but one thing that everyone can agree on is that the right, high quality sounds are key. A lot of white noise machines and sound machines offer good music selection but what happens when newly recorded music tracks are released? At Sound Oasis we know our customers always want the best sleep solutions so we're consistently recording and producing new sounds. We also know that as we continue to add the best white noise sounds, nature sounds and sleep music, our user's should be able to enjoy these new sounds on their devices. After all, you don't want to buy a whole new white noise machine just so you can experience that unique Shinkansen white noise track. Designed to be the Best That's one of the reasons why we've designed our Bluetooth sound machines with removable and replaceable sound cards. Our popular compact sound machine BST-100 (as well as BST-100B) and the powerful Stereo Bluetooth Sound Machine BST-400 all accept new sound cards with the latest sounds - and the best part is, you can choose from over 100 sleep and relaxation sounds to create your own experience. So the question becomes... How can you update your Bluetooth sleep machines? Creating the best sound machine is quite simple - just follow these steps: 1.Visit the custom sound card page 2.Select either a 10 sound card or 20 sound card best sound machine with white noise 3.Click the "Add to Cart" button to be taken to the sound selection page add custom sounds to cart 4.Choose the sounds you would like your sound card to contain - you can preview any of the sounds before choosing them by clicking the "Preview" button .The sounds that you select are shown on the right hand side below the checkout buttonchoose your sleep 5.Once your sounds have been chosen, click on the checkout button and follow the checkout process 6.After the process is complete, we will create your sound card and mail it to you directlyAll Rights Reserved