This guide covers the main functions and features of the W4 personnel tag.


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Use Cases

People wear the W4n tag, known as the wrist tag, to provide real-time safety features and tracking. Widely used in the medical field and hospitality industry, the W4n tag operates in either or both Wi-Fi and or BLE infrastructures.

Physical Description

  • Materials: ABS plastic
  • Tag Dimensions: 2 x 1.9 x 0.7 in / 51.5 x 50 x 17.5 mm
  • Weight: 1.09 oz / 31 g
  • Operating Temperature: 32 to 122 °F / 0 to 50 °C
  • Storage Temperature: -40 to 140 °F / -40 to 60 °C
  • Humidity: 95 % non-condensing, relative humidity
  • Protection: Splash-proof in 3 directions, ultrasonically welded enclosure with sealed connector
  • Presentation: Normally worn with the included wrist strap, or with a standard hospital allergy strap to prevent easy removal
  • Cleaning: Clean and sterilize with CaviCide Solution or wipes. (Long term use of Virex TB can damage the tag enclosure and is not recommended.)
  • Charging: The built-in rechargeable battery may last up to three days and recharges in about an hour or two. Battery duration depends on the location update interval and communication methods. W4n chargers are available as for multiple tags and individual tags. 



For detailed specifications, see the W4n Wi-Fi / BLE tag datasheet.


  • FCC: Part 15 (US and Canada)
  • FCC ID TA7-B400
  • CE Mark (European Union)
  • Medical SAR: The SAR MPE limit for 2.4GHz is 1.0mW/cm2. SAR levels should be less than 1.2 W/kg. This equipment complies with FCC Radio Frequency Electromagnetic Signal (RF) exposure limits set forth for an uncontrolled environment of portable transmission. This product has been evaluated for RF exposure at a distance of 0.3 inches (9 mm) from device antenna to body. Operation at a separation distance less than 0.3 inches (9 mm) from the radiating element to nearby persons will expose nearby persons to RF levels that exceed the FCC rules for RF exposure.
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