How many watt hours? tsa require less than 300 watt hours to bring a device. i would like one that i could carry on with me thanks if you know :)

The batter inside is rated at 3.7 volts, and 40000mAh (40Ah) results in 40x3.7 watts for 1 hour which is 148 whr.

Will this work to power a gopro hero10?

Yes easily, it has more than enough power.

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Description

⚡ Power Up Your Life – Stay Charged, Stay Connected!

SMART LED INDICATOR - Stay informed with an intelligent LED display that shows remaining power at a glance.
UNLEASH POWER ON THE GO - With a staggering 40000mAh capacity, never worry about running out of juice!
RAPID RECHARGE TECHNOLOGY - Experience lightning-fast charging speeds that keep you connected.
SLEEK AND PORTABLE DESIGN - Compact enough to fit in your bag, yet powerful enough to charge your devices multiple times.
CHARGE MULTIPLE DEVICES SIMULTANEOUSLY - Equipped with multiple output ports for your smartphone, tablet, and more.

The ROMOSS Powerbank 40000mAh is a high-capacity portable charger designed for the modern professional. With its ability to charge multiple devices simultaneously and rapid recharge technology, it ensures you stay powered up wherever you go. Its sleek design and smart LED indicator make it a must-have accessory for anyone on the move.

Specifications

Unit Count	1.0 Count
Item Dimensions L x W x Thickness	6.69"L x 3.19"W x 1.73"Th
Item Weight	952 Grams
Battery Cell Type	Lithium Polymer
Color	Black - 18W
Warranty Type	12 Months Worry Free Warranty
Recommended Uses For Product	Laptop
Charging Time	16 Hours
Compatible Devices	Iphone, Samsung, macbook, Ipad, Nintendo Switch, Tablet, Smartphone
Portable	Yes
Voltage	5 Volts
Power Source	Corded Electric
Amperage	2 Amps
Number of Ports	4
Connector Type Used on Cable	USB Type C, Micro USB, USB Type A
Battery Capacity	40000 Milliamp Hours
Additional Features	Digital Display, Auto Shut-Off, 18W Fast Charge

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