TESNA GOG100 vs GOJ05: which open-ear sport buds suit you
In short
The GOG100 suit sprints, the gym and training with jumps. The GOJ05 suit long runs, where every gram counts.
Grip and weight
Both have hooks. The GOG100 have a flexible titanium core that holds steady through sudden moves, and weigh 9.4 g a bud. The GOJ05 weigh 8.1 g a bud.
Water and sweat
The GOG100 are IPX5, for water jets and heavier rain. The GOJ05 are IPX4, for splashes and sweat.
Battery and sound
The GOG100 last 10 hours per charge plus 32 from the case, and ten minutes of charging gives roughly two hours; they have a 16.2 mm driver and Bluetooth 5.4. The GOJ05 last 8 hours plus 24 from the case, with a 14.2 mm driver and Bluetooth 5.3.
Sound
The GOG100 has a 16.2 mm dynamic driver and the GOJ05 a 14.2 mm one. You hear the difference mostly in the bass: the GOG100 sounds fuller, which helps outdoors, where wind and traffic steal the low notes. The GOJ05 sounds clean and balanced, suited to podcasts and music at moderate volume.
Both use the SBC and AAC codecs and connect to iPhone and Android. The GOG100 has Bluetooth 5.4, the GOJ05 Bluetooth 5.3; in practice both hold a steady connection to a phone in your pocket or on your arm.
For which kind of athlete
Choose the GOG100 if you do sprints, intervals, CrossFit or gym work with sudden moves: the titanium-core band keeps the bud in place when you jump, and IPX5 handles heavy sweat and water jets.
Choose the GOJ05 if you run long distances at a steady pace, walk a lot or want the lightest buds: 8.1 g a bud against 9.4 g, with IPX4, enough for sweat and rain.
If you do a bit of everything, the GOG100 is the safer pick; if comfort comes first, the GOJ05.
Battery in practice
The GOG100 lasts 10 hours on a charge plus 32 with the case, 42 in all. The GOJ05 lasts 8 hours plus 24, 32 in all.
For a daily one-hour workout, with either pair you charge the case about once every three or four weeks. For an ultramarathon or a long mountain hike, the GOG100's 10 hours give extra margin.
Price
The GOJ05 cost less, and the GOG100 cost more for the titanium band, the larger driver and IPX5 protection. Current prices are on the product pages. If you do not need the firm hold for jumping, the GOJ05 give you nearly everything that matters for running, for less.
What they share
Both are open-ear hook buds: they sit behind the ear, leave the ear canal open and let you hear the traffic and the people around you. Both connect over Bluetooth to iPhone and Android, use the SBC and AAC codecs and come with a charging case.
The differences are in the hold, the weight, the water resistance and the battery. That is why the choice depends mostly on how you train, not on the sound.
Quick charging and care
The GOG100 charge quickly: ten minutes on the cable gives you roughly two hours of playback, handy when you notice before a workout that the battery is flat. The GOJ05 housing is made to be rinsed after heavy sessions.
With both, after sport, wipe the hook and the charging contacts and let the buds dry before you put them in the case. Dried sweat on the contacts is the most common reason a bud "will not charge".
Keep the GOG100 hook in its shape: the titanium band is flexible, but it is not made to be bent many times at the same point.
Every model is in the shop, under open-ear sport earbuds.