Español 
Most popular bluetooth speakers
Comparing JBL Flip 4 and Sony SRS-XB21
Lowest price found: $70.95
Show listings Show reviews (this price was last seen 2 hours ago on this listing)
Lowest price found: $52.99
Show listings Show reviews (this price was last seen 23 hours ago on this listing)
Physical Features
Speakers range from not being able to handle even a drop of water to being able to be fully submerged in water for several minutes. Do you plan to take your speaker outside? To the beach? To the pool? In the shower? Then you definitely need to verify the level of water resistance before purchasing. You can tell the water resistance by the IP rating—the higher the rating, the more resistant the speaker is to the elements. For reference, the first digit refers to dust protection and the second digit refers to water protection. It reads as: IP68. Anything higher than IP66 will be dust- and splash-proof, meaning it can handle some contact with water, but cannot be fully submerged or soaked.
Water Resistant
IPX rating if applicable
IPX7 - Immersion up to 1m
IP67 - Dustproof and can withstand being submerged in 1m
Dustproof Dust is a difficult element to combat, since it accumulates naturally and you have very little control over its ability to clog up your speaker. Dust and electronics just don’t get along very well. A ... Show more
Rugged Design Bluetooth speakers can be durable, rugged, shockproof, dustproof, armored, splash-proof, water resistant and waterproof - all of which can be overwhelming and confusing. In order for a speaker to be c ... Show more
Battery life for Bluetooth speakers is measured in milliampere hours (mAh). Manufacturers will report the battery life of a speaker in the average number of hours it takes to empty from a full charge. Keep in mind this number is based on medium levels of usage. If you play the speaker on full volume, it will drain the battery faster. Some specialty features like using the speaker to charge your phone or casting an LED light show will also drain the battery faster. The manufacturer reported number is just an estimate, and may be slightly different based on your usage.
It’s also important to consider is the type of battery. Rechargeable lithium-ion (LI-ion) batters are ideal, but some speakers only take standard or rechargeable AA/AAA/C/D batteries. You may even find Bluetooth speakers that recharge via solar power—great for outdoor use!
Battery Life
Charging Time
How long it takes to charge the battery
no data Know this info? Contribute!
battery_charging_full
Power Bank This refers to the speaker’s ability to act as a charging station for your device. In addition to input power (which charges the speaker), some speakers also come with output power, meaning it can cha ... Show more
Sound Quality
speaker_group
Sound System A speaker’s sound system is described as either mono or stereo. Mono speakers play audio from a single channel, giving the impression that the sound is coming from one direction. Stereo uses two or mo ... Show more
Stereo
Stereo
speaker_group
Number of Drivers To understand the inner-workings of a Bluetooth speaker, look first at the number and type of drivers. Drivers are the cones or horn-shaped objects inside the speaker box. The number of drivers tells ... Show more
no data Know this info? Contribute!
wifi_tethering
Subwoofer Having a separate speaker driver dedicated to the lower frequency tones gives your speaker a more robust, rounded out sound. It allows the other drivers to focus on the sounds that they’re best equipp ... Show more
Speaker Breakdown Use the speaker breakdown to better understand sound quality based on the makeup of the speaker. Manufacturers will often report additional details on the speaker drivers, such as the shape (cone or d ... Show more
Two 40mm transducers
no data Know this info? Contribute!
Total Output Power Also known as “power handling,” a speaker’s total output power is recorded in wattage. A watt is a measure of electrical power. Thus, higher output means more powerful (or louder) speakers. When deter ... Show more
no data Know this info? Contribute!
graphic_eq
Frequency Range Measured in Hertz (Hz), frequency response range describes how high and low a speaker can play. The larger the range, the better the speaker will be at reproducing the audio being played. As a frame o ... Show more
70Hz – 20kHz
20 Hz–20,000 Hz
wifi_tethering
Connectivity
Bluetooth Range If you can find it, you should always check the Bluetooth range of your speaker. You won’t realize it isn’t long enough until it stops working for you! Bluetooth range is important for a couple of rea ... Show more
Hands-Free Function If you plan on using your speaker to make and take calls, it needs to come equipped with a built-in microphone and speakerphone. To make a call, you can use voice-activated dialing or key in the numbe ... Show more
device_hub
Connects to Multiple Devices In most cases, your Bluetooth speaker will connect to one device at a time and your device will connect to one Bluetooth speaker at a time. Some speakers come equipped with a feature that allows you t ... Show more
settings_input_composite
Aux Cable Port While Bluetooth is a quick and easy way to connect your device to a speaker, at times you may want to use a hardwired connection instead. You would do this through a 3.5mm headphone or auxiliary jack. ... Show more
phonelink_ring
Remote / App Control Apart from the controls on the speaker itself, some Bluetooth speakers may come with a remote to turn the speaker on or off, activate Bluetooth scanning, turn volume up or down, or respond to calls. I ... Show more
speaker_group
Connects to Other Speakers Generally speaking, Bluetooth speakers aren’t usually meant to connect to other Bluetooth speakers unless they come equipped with a hub or transmitter. In those situations, your device connects to the ... Show more
nfc
NFC Near Field Communication (NFC) is a new technology that allows you to connect devices by simple tapping them together. To use it, your device (phone, tablet, computer, etc.) and your speaker must have ... Show more
AirPlay AirPlay is a feature for Apple products that offers another way to connect your devices to Bluetooth speakers. The speaker must come equipped with AirPlay in order for you to connect your Apple device ... Show more
Basic Info
Brand
JBL
Sony
Model Numbers
Mouse over a model for a picture
Rank: #1 out of 360.
Details
- Wirelessly connect up to 2 smartphones or tablets to the speaker and take turns playing impressive stereo sound
- Built-in 3000mAh rechargeable li-ion battery Supports up to 12 hours of playtime
- Ipx7 waterproof means no more worrying about rain or spills... Read more
- Feel the power of extra bass with live sound mode for an immersive 3D sound experience
- Waterproof and Dustproof IP67 design for worry-free usage
- Add a splash of Colored light with a single-colored line light
- Listen all day and night with up to 12 hours ... Read more
Additional Features
Additional Features
Any other features that make this device unique
no data Know this info? Contribute!
Easy button control
Accessories
Chargers, cables, cases that come with the device
Micro USB Cable
USB Cable
General Info
Warranty
1-Year Warranty
1 Year Limited Warranty
Video reviews
We found 7 video reviews
Video review 1 / 7 ()
We couldn't find any video reviews for Sony SRS-XB21 yet
Deals up to 80%
Every day we track the Internet for thousands of deals - get the best ones sent to you.
Millions of products go on sale every day. Who has time to keep track of it all? We do, for your convenience.
Millions of products go on sale every day. Who has time to keep track of it all? We do, for your convenience.
You can unsubscribe at any time, of course
Customer Reviews
Reviews from real customers who bought the product on Amazon