Note: DC + 3.3V is used in R558S power supply design. Power input is not allowed until the R558S is connected. If the cable is plugged or unplugged (with hot plug), the electronic components of the R558S be damaged. make sure that the power is cut off during cable plugging. Poor power connection, too short interval power off and on operation, or too large voltage drop pulse may cause the R558S not to be in a stable and normal working state, so it is necessary to keep the power input stable. After turning off the power input, it is necessary to turn on the power input again at an interval of more than 2 seconds. Parameter: Image pixels: 112*88 Resolution (dpi): 508 Sensor wear resistance: 200,000 times Storage capacity: 100 fingerprints Matching method: 1:1, 1:N Whether there is self-learning: Yes Whether there are lights: colorful lights Fingerprint image collection time: Less than 180ms Algorithm search time: Less than 100ms(50) Overall recognition time: Less than 0.6s (50 pieces) Startup time: Less than 50ms False recognition rate (FAR): Less than 0.001% True rejection rate (FRR): Less than 1% Communication interface: UART (3.3V) Communication baud rate (UART): 57600 (default) Supply voltage: 3.3±0.3(V) Maximum current: Less than 40(mA)/ Shutdown current: Less than 12()/ VADD Operating temperature: -30°C to 70°C Storage temperature: -40°C to 85°C Relative humidity: 20% to 85% (non-condensing) Antistatic capability (ESD): contact discharge ±8KV, non-contact discharge ±15KV Working vibration: 10-150HZ, 0.5G, 3 axial directions, 1min/oct, 1 time/axial direction Drop: can withstand a 1.2-meter drop to the concrete floor IP rating: Front waterproof IP54 Colour:Photo Color Material:pla Package Contents: 1 x Fingerprint Module 1 x cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.