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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规格

ASIN	B0752CTWCX
Additional Features	Hi Res Audio, USB Port
Age Range Description	Adult
Antenna Location	Music,Home Theater
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo, Surround Sound
Battery Charge Time	40 Hours
Best Sellers Rank	#15,157 in Electronics ( See Top 100 in Electronics ) #3 in Home Theater Systems
Bluetooth Range	32.8 Feet
Brand	Rockville
Built-In Media	User Manual, Speaker, 3.5MM to dual RCA cable, Remote Control (Battery included)
Color	Cherry Wood
Compatible Devices	Laptop, Personal Computer, Phones, Tablet, Television
Connectivity Protocol	Bluetooth, USB
Connectivity Technology	Bluetooth, RCA, USB
Control Method	Remote
Controller Type	Hand Control
Customer Reviews	4.2 4.2 out of 5 stars (1,975)
Enclosure Material	Wood
Frequency Response	20 KHz
Global Trade Identification Number	00819216020050
Impedance	8 Ohms
Input Voltage	110 Volts
Is Waterproof	False
Item Dimensions D x W x H	11.62"D x 6.62"W x 12.41"H
Item Type Name	bookshelf-home-speakers
Item Weight	5.43 Pounds
MP3 player	No
Manufacturer	Audiosavings
Maximum Range	35 Feet
Model Name	RHB70
Model Number	RHB70
Mounting Type	Tabletop Mount
Number of Audio Channels	1.0
Number of Items	223
Power Source	Battery Powered
Speaker Maximum Output Power	50 Watts
Speaker Size	4 Inches
Speaker Type	Powered Speaker
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	4 Inches
UPC	819216020050
Unit Count	1.0 Count
Warranty Description	1 Year
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	10.16 Centimeters

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