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Monochrome display quality like for example at cheapest Amazon Kindle (to be easy read at direct bright sun) enough size to be easily readable letters of functions, let say 1 - 1,5 Inch diagonal. Or colour display enough size for photo, but no video quality. Metal housing covered with thin rubber.
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No Video (That is, if video is included then display size should be atleast 4 inch or bigger. Smaller display and there is no need for video possibility).
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Tactile (button) or/and mechanical wheel commands
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User replaceable standard batteries (Alcaline/NiMH, Lithium, whatever but that can be easily bouhgt in electronic shops not only in 1. but also in 2. and even 3. world countries. For example I am from Bosnia and Herzegovina) with atleast 30 hours play when used for example AAA alcaline batteries and more time for higher capacity batteries (let say about 60 hours with 2700mAh AA NiMH batteires)
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64GB starting and more capacity. Micro SD or full SD card slot (even if player has large internal memory there is need for SD card slot. If not for more capacity, then for having particular files not in player but on memory card).
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Option to shut off tags, to speed up ON time (no need to loading tag structure when turn player ON, look at point 7).
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Well, computers have made directories/files structure decades ago. Just implement that into player, don’t “invent hot water” There are well documented proven solutions, just use them. You can include tag structures if people want to use them, but let standard computer directories/files structure to be default.
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Why not Linux (Ubuntu) based player (no Android, please). But this would be maybe too much
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AM/FM radio.
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Price tag 150 USD for such player with 64GB memory as starting model. Up to middle 2013. After that or more memory in starting model or lower price.
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Volume limit changeable That is, for selling in EU if volume must be low by default, user changeable to high volume.
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Excellent quality sound (Wolfson DAC and other sound processing chips, or if there better than Wolfxon, than use that).
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Enough power to drive real HiFi headphones.
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Line in, line out in more expensive higher models. Voice recording too. Of course if those could be inplemented in basic model without higher cost, then do that by all means.
I would by such player even without included headphones for keeping cost down. After all, everyone who want better sound buys separate headphones anyway as those that come with players of any manyfacturer and any price range are low or middle quality.
Thing that I hate is when manufacturer make basic model for example for 50 USD. Then add some function which cost maybe 5-10 USD, but sell that player for 100 USD as advanced model. In one word, please, don’t make fools of your buyers. Don’t play marketig games and name players as “pro” equipment just to sell them for more money with adding function which are not expensive to add. Why, for example, player couldn’t have all functions (beside basic functions to have Line in, line out, and all other advanced functions) without separating models as basic, advaced and pro, and only difference to be internal memory capacity and difference prices because of internal memory and nothing else.
