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<summary>does this light have a 1/4 20 thread female hole? thanks</summary>
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Yes it has a 1/4 20 thread female hole and it's a metal thread and also has two cold shoes one on ether side</div>
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<summary>What does the M button do? It says it switches between power and light. By power, does it mean that it shows the remaining charge in the battery? i</summary>
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Hi when you push the M button the red leds light up showing how much power you have left.</div>
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Can this light be used to take flash photos with my slr camera? or does it stay on continuously?</summary>
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Ulanzi VL49 is just a continuous light that works with any photo and video camera either mount it on the camera or stand it on a separate stand but it never change to a flash light.</div>
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