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Onboard IO protection circuit for surge suppress; Onboard TTL serial port 3.3V and 5V voltage level switch, allows selecting TTL level Onboard resettable fuse and TVS diode, providing protections including over-current, over-voltage, backward-proof, and ESD protection, improving shock resistance, safe and stable communications 3x LED indicators for easily checking power connection and signal TX/RX statuses Quality plastic case with dull-polish surface, well-crafted IDC connector with fool-proof design