I have a laptop which I use for lesson planning, presentations, playing video or sound clips. I tutor MFL so I got one with a CD/DVD slot and can therefore use the CDs I have for listening comprehensions. I have also used it with my adult learners to play video clips and extracts from Euronews. I also use the client's WiFi, or if they are not keen to grant me access (or can't find the special code key) then I ask them to use their laptop or tablet and just give them the URL. I did buy an MP3 player and thought I would use it more, but the lack of speakers is an issue (could plug some in, but they are a pain). However, it also does voice recording so I may use it to record oral exam practise and play back.... or to make my own listening comprehensions. Also have work mobile which is a cheap smartphone so I can check e-mail on the move, look things up on the internet if necessary and also get texts and calls to a business line. My accountant tells me that I should count these things as capital allowances and there is some limit under which you write it all off in one year rather than worry about depreciation. Think it was about £300 but don't remember.