WPX S1 and S1 PRO
A Qi Sniffer for real phone charging. Observe power and Qi ASK / FSK communication, and connect the details of each wireless exchange.1
BPP · EPP · MPP / Qi2 / Qi2.2 · Some proprietary protocolsRecognition depends on the devices and current firmware.
What makes S1 different
Keep the real phone in the test
Rather than replacing the phone with a receiver fixture, observe its exchange with the transmitter. Compare charging behavior across phones, charging pads and adapter combinations.
Low-disturbance capture
The low-inductance sensing coil does not inject or modify communication data. A thin structure reduces the added gap, keeping the test closer to the original charging conditions.
Connect power with communication
What can the transmitter negotiate? Which mode is active? How is the current reading changing? Read power alongside protocol information for a better-informed view.
Observe while charging
Place S1 between transmitter and phone, with the display unit to the side. USB-C power lets you check status independently; connect a computer to explore the communication in detail.
Use a stable 5 V / 1 A USB supply. For desktop analysis, connect to the computer with a data-capable cable.
Keep all three charging centers aligned and the stack stable. Avoid thick phone cases and metal objects that could affect the test.
Wait for charging to begin, then consider the identified protocol, negotiation information and changing power readings together.
Different power values. Different meanings.
Transmitter capability, negotiation and current power are different things. S1 brings them together to help you understand whether charging has reached the expected state.
The highest negotiable power capability declared by the transmitter. It describes capability, not the power being delivered at this moment.
Follow power negotiation during the handshake. The agreed contract power is available on the LINK page and must not be confused with current power.
Current power derived from protocol data and device algorithms. Watching it change over time is more informative than reading a protocol name alone.
Seeing Qi2.2 does not mean the phone is currently charging at 25 W.
1. About the data: Phone power, voltage, current, battery level and device information primarily come from wireless charging protocol analysis and device algorithms. Available fields and recognition depend on the protocol, phone software, transmitter implementation and firmware. Some fields may be absent or decoded incorrectly. Consider negotiation, current readings and charging conditions together, rather than inferring power from a protocol version alone. Read the full manual.
Thin by design
Approximately 0.11 mm at the sensing area, excluding the display unit.
A thinner sensor means a smaller added gap. S1 PRO offers another option when the effect of inserting a test device matters to your analysis.
S1's approximately 1.1 mm magnetic structure puts straightforward, repeatable alignment first.
Dual FPGA architecture
High-speed signal capture
12MSPS12 MSPS capture, SDR I/Q decoding and hardware timestamps turn wireless exchanges into waveforms, edges and timing you can inspect.
Qi protocol analysis
From ASK / FSK packets to decoded fields, waveform navigation and time cursors. Move from “how is it charging?” to “what happened along the way?”
Inspect communication direction, packets and fields in time order. Follow identification, configuration, negotiation and power transfer.
Use the charging phase, recent EPT information and waveform timing to review key events around an interruption and investigate compatibility.
Filter packets, zoom into events and measure timing with cursors. Save the complete session for later reproduction and review.
Read receiver identity and declared capabilities to investigate phone and compatibility differences.
QI VERSION / PRMC / BASIC ID / RX CAPSInspect transmitter capability, the currently negotiable limit and reported reasons for power limits.
POTENTIAL / NEGOTIABLE / PTMC / LIMITCheck the mode, charging phase, agreed power contract and most recently observed EPT reason.
MODE / PHASE / CONTRACT / LAST EPTDevice identity depends on protocol data and the database. Declared authentication capability does not prove successful authentication; an unobserved foreign-object or EPT report does not rule out every fault.
One device. Two desktop perspectives.
Use the device display for a quick view of charging status. Connect WPX software and choose normal or professional mode for the depth of analysis you need.
Normal mode · Everyday testing
View received power, rectified voltage and current, battery level, protocol, frequency and charging phase. Follow stability and changing parameters on curves.
Curve data CSV import / exportProfessional mode · Communication analysis
Inspect ASK / FSK packets, raw waveforms, decoded fields and protocol timing, with packet filtering, event navigation and time measurement.
Complete test session savingUSB-C data connection · Windows 10 (64-bit) or later · Runs without installation after download; refer to the software release notes.
AI MCP
Connect the device and an AI assistant through an MCP service. Use natural language to read status, assist with protocol review and explore scripts and automation workflows.
Read device status, then group recent valid packets by ASK / FSK. Look for repeated messages, checksum anomalies and event order.
This is a task example. Verify AI analysis against the original data; it does not replace measurement or engineering judgment.
Interactive 3D view
Open a full-screen model explorer to rotate, zoom and pan each device before choosing the right S1 for your test.
S1Magnetic alignment · Direct setup
Rotate the device to inspect the display unit, sensing area and magnetic positioning structure.
Open S1 viewerS1 PROFlexible FPC · Smaller added gap
Explore the transparent flexible FPC and side unit when insertion impact matters most.
Open S1 PRO viewerChoose your S1
The key choice: straightforward magnetic positioning or a smaller added gap.
Magnetic alignment. Straightforward setup.
1.1 mm
Approximately 1.1 mm sensing area
For everyday debugging, quick positioning and comparisons across different phone and transmitter combinations.
Designed for a smaller added gap.
0.11 mm
Approximately 0.11 mm flexible FPC sensing area
For analysis where the charging gap and the effect of inserting a test device deserve closer attention.
| Specification | S1 | S1 PRO |
|---|---|---|
| Sensing-area thickness | Approx. 1.1 mm | Approx. 0.11 mm |
| Sensing design | Magnetic alignment | Ultra-thin flexible FPC |
| Charging efficiency impact | ≤1% | ≤0.2% |
| MatedQ change | ≤2.3% | ≤0.27% |
| K-value change | ≤3% | ≤0.1% |
Structural and performance data are from the product brochure. Thickness excludes the display unit; efficiency impact and change rates are not measurement-accuracy specifications. Recognition supports Qi BPP, EPP, MPP / Qi2 / Qi2.2 and some proprietary protocols, subject to current firmware and the devices used.
Battery level, temperature, phone software, the adapter and transmitter capability all affect power. Consider negotiation and changing current readings together; a Qi version alone does not establish a particular charging power.
These fields depend on the device's protocol messages, the recognition database and current firmware. Missing or unsupported fields may not appear. Their absence does not by itself mean the phone is not charging normally.
You can view charging status on the device without a computer, but S1 still requires USB-C power. Connect a data-capable cable and desktop software when you need detailed packets, communication waveforms and protocol timing.
In the box
Package contents depend on the model purchased.
Product and usage images are rendered illustrations; displays and charts do not represent live measurements. Phones, chargers and computers are scene accessories, not included in the device package. Illustrated spacing is not an operating-distance specification. Features, available fields and export options depend on current firmware and software.