How do you hook it up to a laptop?

If your laptop has Bluetooth you connected that way. If not you use the RCA cord that's included that has a headphone jack. Plug it into the headphone jack of your laptop.

Can it be used at 220V as well as 110V voltage?

Rockville website says input 110v. https://www.rockvilleaudio.com/rhb70/?gclid=CjwKCAjwkYDbBRB6EiwAR0T_-lEYVmpz-aeYBCy2-v19wOedo0Lz7M5BnNKtcAI0AlC_Omw3r09HlBoCa8MQAvD_BwE

Can you connect a microphone to this

Yes you can use a mic with any system. There is literally an adapter for everything. Clearly this unit comes with a regular headphone/phone/tablet audio wire with RCA on the other end...Which mean all you need is a small adapter that takes whatever mic plug and has a 3.5 (regular audio like average headphones or phone) out. So if that sounds confusing it really is not. Figure out what your mic is, if it is the kind that most use, which will plug into an amp, then it will be very easy to find the right adapter, and likely it will cost 15$ or less. We have one here that you could use...Anything that you can plug your mic into that has a 3.5 output will work, even if it is not an adapter. We also have such devices here. REMEMBER, there is an adapter for all things audio and video....you can even buy a adapter that allows you to use your PC to record multiple channels that prevents the cable box from passing along the encryption that prevents recording live TV. Always an adapter for all things. ALWAYS! hope this helps.

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Specifications

Power Source	Battery Powered
Input Voltage	110 Volts
Speaker Maximum Output Power	50 Watts
Compatible Devices	Laptop, Television, Phones, Personal Computer, Tablet
Speaker Size	4 Inches
Woofer Diameter	10.16 Centimeters
Water Resistance Level	Not Water Resistant
Bluetooth Range	32.8 Feet
Specific Uses For Product	Home Entertainment
Controller Type	Remote Control
Color	Cherry Wood
Is Waterproof	FALSE
Control Method	Remote
Audio Output Mode	Stereo, Surround Sound
Mounting Type	Plug Mount
Speaker Type	Powered Speaker
Additional Features	stereo_pairing, display, bass_boost, Radio, usb_port
Recommended Uses For Product	Music,Home Theater
Subwoofer Diameter	4 Inches
Item Weight	5.43 Pounds
Item Dimensions D x W x H	10.7"D x 4.8"W x 9.7"H
Unit Count	1.0 Count
Number of Audio Channels	2.1
Battery Charge Time	40 Hours
Connectivity Protocol	Bluetooth, USB
Wireless Technology	Bluetooth
Connectivity Technology	Bluetooth

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