You can't beat this light for the price. The provided mount works great attaching it to the seat post as shown. Very bright, very light, very easy to turn off and on, and VERY rugged.. I bought two as I have the second in my jersey pocket (along with spare battery for led headlight use at night - I go out long enough that I sometimes need two 4 cell batteries) but I ran it for five hours on lowest flash rate and power (not much less than full power and flash rate) so haven't used it yet until fully discharged. I just charged up after five hours, so don't know how long they last, but at least five hours. I try to always fully discharge before charging as I have n idea what kind of battery is actually in the light - NiCd, NiMh, or LiON.

Two notes:
1) IF you use the light on a seat bag loop attachment, it is not as tight as the included mount. I did that and fortunately heard it fall off, locked back and saw it flashing on the street and went back and picked it up. Might want to use a secondary rubber band around it if you do that mount.
2) When you charge it, the light should turn blue when it is fully charged, a very handy feature. If it does not, contact the seller and they should replace. My vendor (Mevell) did and I'd give them six stars for the excellent customer service. They overnighted another one ( I have Amazon Prime so that might have been why) to replace the one which didn't turn blue when charged. It worked 100% just doesn't turn blue when charged.

Overall, can't recommend this light enough. Very well made, bounced off my bike and stayed in one piece. Other bike tail lights I've had were so fragile that they "exploded on impact" but not this one.

I really like this little, rechargeable tail light. It is easy to install (with the included parts), it recharges quickly, and lasts for several hours per charge (depending upon the light setting). I bought this light this summer and have used it every ride. I had my wife follow me in the car during a daylight ride, and she said it was very easy to see the light from 1/4 mile away. I use the slow, alternate-flashing mode and the light lasts for 8-10 hours. When it needs to be recharged, it is easy to remove from the holder.

UPDATE 08/10/2019 I lost my 1st Cycle Torch light. I thought I would clip it to my small saddle bag under the seat, but it fell off. I like it so much I ordered a new one and will attach it to the included clip--it never moved a millimeter when attached to its own clip. The new light has a different on-off pattern. The light sequences are the same, but to turn it off requires a long press. When you turn it on it turns on to the last setting, instead of cycling thru the different patterns (which I actually like). This is a great, very bright light that is reasonably priced.

I just got this and haven't attached it yet.
It is small but it has several light settings from all on to various blinking modes and it is very bright; don't let the size fool you. The big thing is the rechargeable battery, no more carrying extra on a trip.
It appears the attaching method is very secure.
I'll update this review after I use it.

Update 3/3/19:
Used for a week and found it to be a great product. After about 4 hours and still working without a charge. I bought a similar one a year ago and the red top came off the first time out. The red top on the Cycle Torch is not removable so that cannot happen and it should be waterproof as well.

Received my Cycle Torch MicroBot Taillight yesterday and immediately used the enclosed USB cord to fully charge this incredible small light.
Installation was very easy with also enclosed rubber stretched black band.Personally,I attached mine to to the seat post which will give great visibility to all those bikers as well as drivers to see me,whether it's day or evening.As I turned my unit on I couldn't help but have a huge smile on my face as to how bright this taillight is! I'm not sure what I really was hoping for in the intensity of light from such a small unit but I was REALLY surprised and pleased with what I now own!!!!
This taillight far and away surpasses anything I could have hoped for.
Great product,easy to attach to your bike and absolutely great light to be seen by.I have every confidence in the world that I can be seen by everyone behind me.Best money I ever spent on safety for me and my bike.

Well made and easy to install.