SRV05-4 is a 'Transient Voltage Suppressor' circuit used mainly for ESD protection in 5V data circuits, like USB 2.0 devices. It's used in the Lotus 58 Glow to protect the serial link on both the TRRS version (optional) and the USB type C version (already included in kit).
Please not that this a small SMD components, so inexperienced builders can leave it out, and still use the device with less redundancy.
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The SE/EU "Act on Distance Contracts and Off-Premises Contracts (SFS 2005:59)" allows returns of the items in undamaged (unsoldered!) condition within 14 days of receiving it. Return shipping on returned items are the responsibility of the buyer.