Technical specifications
Fourth Frontier
Last Update 20 hours ago
⚠️ The Frontier X3 column is incomplete. Rows marked "To be confirmed" have no published value yet. The Frontier X2 figures do not carry over — the X3 uses a different radio, battery and charging port — and must not be copied across to fill the gaps.
| Item | Frontier X2 | Frontier X3 |
| ECG output | Live ECG streaming, ECG PDF download, EDF export, ECG ZIP download | None — the device does not display or provide an ECG output. |
| ECG signal | Single lead, 500 sps, input impedance > 1 GΩ — sensed and used to derive metrics. | Single lead, sensed and used to derive metrics; sampling rate to be confirmed. |
| Bluetooth | BLE 5.2 | 6.0 |
| TX Power | Up to 6 dBm | To be confirmed |
| Simultaneous connections | 3 (1 mobile app + 2 external HRMs) | To be confirmed |
| ANT+ | Not supported | Not supported |
| Memory | 256 MB (~24 hours of data) | To be confirmed — X3 docs state ~24 hours, which conflicts with the 7-day recording claim |
| Weight | 25 grams | 23 grams |
| Dimensions | 73 × 24 × 13 mm | 73.6 x 25.1 x 14 mm |
| On-device display | Colour display | None — LED only; battery and memory shown in the app |
| Device identification | Device ID shown on the display | Serial number printed on the side of the device |
| Water Resistance | IP67, up to 1.5 metres | IP67 — pending certification sign-off |
| Battery Life | Up to 24 hours continuous; ~14 days at ~1 hr/day | 7 days recording 24 hrs/day; ~4 months at ~1 hr/day |
| Charging Cable | Micro USB Type B | USB Type-C, with quick charge |
| Posture tracking | Not available | Not yet implemented will be supported in future. |
| Lead-on detection | Not available | Not yet implemented will be supported in future. |
| Sleep tracking | Sleep stages — Wake, Light, Deep, REM | Not yet implemented will be supported in future. |
| Reboot | Hold button 5–6 seconds | Hold button 10 seconds |
| Recording LED | Blinking red | Blinking green every 5 seconds |
| Charging LED | Static red | Static blue |
| Connected LED | Blinking green | Blinking alternate blue and green |
| App and Premium | Frontier X app, full entitlements | Identical |