tentacle sync e
timecode generators stripped-down to what you need
Screenshots

Hunter's comment
if you are a vlogger on the move you will eventually hit that situation where you need to sync some audio with video, maybe you have other cameras setup for b-roll or something similar, this thing is frame accurate and can last for ages on a charge.
They are accurate, small, lightweight, smart and easy to use devices. The versatile timecode output of Tentacle will allow you to connect Tentacles to nearly every kind of camera or recorder. From a DSLR to an ARRI Alexa, Tentacle works with them. Once connected, you can leave Tentacles on your equipment for the whole day because Tentacles stay frame-accurate for 24 hours and the built-in battery lasts for up to 40 hours
when used in combination with the tentacle sync studio (free software) you can quickly just put in your media folders and view the synced dailies straight away. super clean interface.
Link
http://tentaclesync.com/sync-e
Contributors
Hunter: @teamhumble

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Pros:
I like its feature where it can last really long, it's a good investment.
It has its own free software to navigate and save your media folders, it sounds awesome because of this feature.
Cons: