My second bluetooth had more battery life (up to 3 hours on standby; about 60 minutes of talk time). - One exposed screw (not under a sticker) to open the mouse. You can pair up to 100 onyx. Just a note if you are small ear sizes this could be the one you are looking for Lovel sliders I ordered this 2 door cabinet and some shelves to stack over it and my existing cabinet. The case doesnt charge so you have to plug it in. I loved this product so much that I ordered more. They were comfortable and fit with the right size I ordered but I think it must be a generic or fake brand. He will be admitted to Emory for stem cell transplant in January and would love to buy him a second pair.