pieces are different, one is for using the unit on your left ear, and the other for your right ear, so if you have to change batteries you will also have to change the ear you a wearing this on

The "bud" gently fits into either my left or right ear, dependent upon which battery is used.

But, to my surprise it fit my ears and does not fall off as so many of the others I have bought

Best ear piece of ever owned

I also love that you have the option to use the left or right ear

I love the fact the design includes 2 batteries, one for the left, and one for the right ear

It came with 2 batteries left ear and right ear.

I have sensitive ears to aching after having them in a long time still but this one allows you to alternate ears so it doesn't get to that point of aching

My one last about 7 hours for one ear - pretty good for all day.

But what I love the most is that I’ll be using it for hours and doesn’t hurt my ear

Earpiece is comfortable and doesn't bother my ear having it on for hours

Fit in the ear great stays in love it because you can change for one ear to the other because it has two pair one for each ear.

Great ear piece stays in ear ok!Would buy again

and I have found, based on another order and reviews, that good single-ear earbuds are hard to find.

I'm deaf in my left ear so one of the batteries is useless

I have sensitive ears to aching after having them in a long time still but this one allows you to alternate ears so it doesn't get to that point of aching

Ear comfortable

I like this bluetooth because it has two batteries, left ear and right ear

I love what I got the earphone fits my ear like a glove don't realize I have it

Nicely packaged and comes with an extra battery so you can wear the device in either the left or right ear

I have been only using the right ear battery and it last all

It came with two ear pieces, one right and one for the left ear

Awesome ear bud set

The battery detaches from the part that goes in your ear and it comes with a battery to go over the right ear and another to go over the left ear.

It came with 2 batteries, one for the left and one for the right ear, and I like that can switch the wearing ear whenever I want

Very nice ear peace

Only inconvenience is you have to switch out the two available ear handles if you want to switch from right ear to the left or vice versa.

This is great ear piece, works great and a very long battery life

Earpiece does not irritate my sensitive ear canal or outer ear

Comfortable to wear, doesn't hurt my ear

This is the best ear peace I have owned

Convenient and fits my lil ears!

The single ear headphone is great in that I can listen while still being aware of my surroundings, a big safety plus.

It came with 3 additional ear plug, 2 batteries: one for right ear and one for left ear

I have very small ears an its hard for me to keep large bluetooths around my ears, but once I tried it out, it worked out a bit better than I thought around my ears as along as im not wearing my glasses but contacts instead

Also, the base is rich and full when the correct ear pieces are chosen.

Very comfortable ear piece.

This headset is excellent because of its design, does not hurt your ears even after prolonged usage, great battery life , replaceable battery, great quality sound

Being able to swap left & right ear is a nice feature

I have very small ears an its hard for me to keep large bluetooths around my ears, but once I tried it out, it worked out a bit better than I thought around my ears as along as im not wearing my glasses but contacts instead

Also since its around the ear, it hasn't fallen off my ear yet while I'm busy moving around

battery stop working and in less than 30 days the other ear battery stop working.

I highly recommend this ear bud for making phone calls and it does work with Siri

Oh, and it’s configurable for use in either the left or right ear, which I think is pretty cool

battery was a little smaller, but I do have super small ears

Also, ear bud came off now useless

and I can change over from left to right ear just by switching the battery