Instruction: Answer the given question using the supporting document.

Input:
Question: Is the earphone jack on this radio 3.5mm (today's standard headphone jack) or 2.5mm (like on older phones)?
Document: It's AM-FM, not shortwave and does not have NOAA Weather, just to clarify some people's apparent confusion. Build quality is good but it doesn't claim to be waterproof.I have bought 4 of these now, 2 as gifts. So I really like them.This is a great, inexpensive little compact AM-FM with excellent reception and good battery life (specs say 40 hours and I probably get about that with rechargeables). Has a 3.5mm standard earbuds jack.
Runtime was 47 hours on Duracell, 46 hours on Rayovac, and 42 hours on Energizer (AM). Those runtimes are on standard alkalines; rechargeables will be a little less, while lithiums will be a lot more. Running the radio without turning it off will decrease those runtimes by half.Size is 2-7/8" wide X 4-3/4" high X 1-3/16" deep (71mm X 118.5mm X 30mm).
If you want to use this radio with headphones, here is some advice on buying accessories.The headphone jack is 3.5mm, also referred to as a 1/8" jack or mini jack. And as noted in other reviews, the jack is mono, which means if you plug in stereo headphones, you'll hear out of only one ear. (Most headphones these days are stereo.
And because the headphone jack is in the middle of one of the sides of the radio, using this adaptor (even with L plug headphones) extends the effective width of the radio, making it more difficult to put the radio in your pocket. (I haven't been able to find an L-plug 3.5mm stereo to mono adapter, neither on Amazon nor on the Internet at large. )Another solution is to buy a pair of mono headphones.
But it does have a 3.5mm jack and it is mono so it plays to one speaker only.Status LED brightens with signal strengthCons:It wasn't $10A black version would be cool too...so no real consI put this in a water bottle pocket in my pack while hiking, I like this because I can hear around me some over using earphones with the eyephone.
However, if you like listening to things like NPR that are on the low end of the band you cannot turn the volume too loudly without this humming interference. Finally, the earphone jack is wired for monaural headphones so the ubiquitous stereo headphones will play out of one speaker, and very quietly in the other speaker. I bought it for non-headphone use so this doesn't really matter to me.
Specifically a 3.5mm stereo female jack to 3.5mm mono male plug adapter for probably around 3 or 4 dollars.
Be careful when you're turning it up while listening to earphones/headphones. Also, the volume wheel can be kind of scratchy at the very low end of the volume range.- Speaking of earphones/headphones, the jack is actually an "earphone" jack, not a "headphones" jack. This means that if are listening through a standard set of stereo headphones, the sound will only come out of the left side.
For a small, inexpensive radio, the Sony pocket radio sounds great. It works on two AA batteries and gets good reception everywhere I go. And it costs $8 bucks. What could be better than that? There is an earphone jack for private listening, but you will only hear sound on one side of the phones. However, there is an adaptor that allows sound to flow into both ears. If you don't want to disturb others, I would recommend getting it.
Great reception. Left ear out only. Volume very sensitive, goes from zero to loud in the haed phones but flows ok through speaker. Only complaint is earphone jack is on the side, would fit better in pocket if it was on top or bottom. Recommend!
Answer: 3.5mm