Description says "no hub needed". So why the switch boy hub does exist then?

No hub is needed as Switchbots are Bluetooth and can connect directly to your phone. Because they connect directly to your phone this only gives you local control. The SwitchBot Hub acts as a bridge between Bluetooth and Wi-Fi giving you remote access to your switchbot

Please clarify when I need to buy the hub vs. buying just the switch?

If you just want to control a rocker switch or a button either with your mobile phone (via free app and Bluetooth), or set timers inside, the you don’t necessarily need the SwitchBot Hub. If you want to make the SwitchBots work with Alexa, Google Assistant, IFTTT and more, or just for remote control, then the Hub is necessary as a Bluetooth to Wi-Fi gateway.

Can i control it using amazon echo or google home?

Yes. I use all my SwitchBots with Amazon Echo. I do not have Google Home, but the literature indicates that it will work with Google Home as well. You do need to purchase a SwitchBot Hub, however, it order to use with either Google or Amazon.

Can I use this to remotely press my computer's power button to toggle it on or off?

Remotely: Yes. 1) Official and Simple Solution - SwitchBot Hub If you have at least one "SwitchBot Hub" (the Hub) near SwitchBots (the Bots), which is a Bluetooth to Wi-Fi gateway and a rainbow color night light, then you could control your Bots from anywhere with Internet connection. Order a SwitchBot Hub on Amazon: https://www.amazon.com/dp/B07C2QVBFN or https://www.switch-bot.com/store. 2) Bluetooth - 80 meters (260 foots) SwitchBot itself is based on Bluetooth (BLE) with a (tested and verified) range of 80 meters (260 foots) in the open filed. 3) DIY - any Bluetooth to Wi-Fi gateway SwitchBot has an open API available for makers to customize and integrate with Raspberry Pi and many others.

Brand	スイッチボット(SwitchBot)
Model Number	Switchbot S1
Product Dimensions	4.25 x 3.65 x 2.4 cm; 42 g
Color	black
Name List for Name Plates	Smart Switch (Black)
Wallpaper Pattern	2) Switch (black)
Power Source	Cordless
Voltage	3 Volts
Quantity	1
Included Components	Instruction manual (English language not guaranteed)
Are Batteries Included	Yes
Battery Type	Lithium Metal
Warranty Description	Warranty period is 12 months from date of purchase
Usage	Clamp
Item Weight	42 g

SwitchBot スイッチボット スイッチ ボタンに適用 指ロボット スマートスイッチ スマートホーム ワイヤレス タイマー スマホで遠隔操作 Alexa, Google Home, Siri, IFTTTなどに対応(ハブ必要) ブラック

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SwitchBot スイッチボットスイッチボタンに適用指ロボットスマートスイッチスマートホームワイヤレスタイマースマホで遠隔操作 Alexa, Google Home, Siri, IFTTTなどに対応(ハブ必要) ブラック