WiCap specification

State-of-the-art sensor technology, high accuracy, high-pressure working, long range and rugged high-quality build

make WiCap the perfect choice for for vehicles that will take you anywhere you want.

UK-designed ASIC (application-specific integrated circuit)

with 16 MHz 32-bit Cambridge ARM Cortex-M0 processor

and AES-128 bit encryption processor and fully-integrated Bluetooth transceiver.



CE certificated.

RoHS compliant.

94V-0 compliant

Radio transceiver

Compatibility: Bluetooth 4.2 and above (ie including 5.0).

Uses Bluetooth Low Energy (BLE)

Compliance: ETSI EN 300 328 and EN 300 440 Class 2 (Europe), FCC CFR47 Part 15 (US) and ARIB STD-T66 (Japan)

0 dBm transmit output power

-20 dBm output power in 'Near Field Mode'

-93 dBm receiver sensitivity

Frequency 2.4GHz

Transmits while vehicle is stationary as well as moving.

Transmission interval: 3 minutes (average)

Range: up to 28-metres (as measured by Boo9

using iPhone 8 Plus, in-vehicle, running TPMSii app)


Pressure sensing

14 to 188psi

1 to 13bar



Pressure sensing: +/- 1% + LSD (last significant digit) at full scale 

Resolution: 0.1psi 

App pressure display increments: 0.1psi  (0.1bar)

Temperature sensing

Incorporated but not applicable to externally-fitted sensors



Standby current: 2.2uA (less when not fitted to a tyre)

TX: 3.4mA

RX: 3.7mA

Battery capacity: 140 mAh. Not user replaceable.

Chemistry: Manganese oxide Lithium

Operational life: typically 2 years

Shelf life: typically 10 years.

Place of manufacture: Mainland China



Sensor weight: 10g

Lock nut weight: 2.5g

Sensor dimensions: 21.6mm  max OD x 20mm height

Fitting: standard Schrader valve

Extension of valve when WiCap fitted: 13mm

(Please check that the WiCaps, when fitted,

will not extend beyond the outer wall of your tyres)


Wheel balance: may be impacted at high speeds by fitting sensors to tyre valves. Generally this is not an issue at legal towing speeds. If vibration is detected or you are in doubt, wheel balancing is recommended


Water and dust protection: IP67

(applicable only when WiCap is fitted to a tyre valve)

Kit contents

Presentation box with magnetic closure

WiCap sensors: 2 or 4

Lock nuts: 2 or 4

Folding spanner for easy lock nut and battery replacement

UK English user guide produced by Boo9

UK English safety guide produced by Boo9



TPMSii app for iOS (iPhone and iPad).

An Android version is available but  currently there are compatibility issues with some Android versions.

Please contact us for the latest information re. work in progress.

Compatible with  Bluetooth 4.2 and 5

App uses mobile device's screen for display of pressure data

Pressure limit warnings: speech, vibration, visual

Speech selectable: on/off

Pressure measurement range up to 180psi (13 bar)

Speech and visual warning (for low inflation pressure) lower limit range: 1.5 to 36.2 psi (0.1 to 2.5 bar)*

We are currently developing our own very advanced app. Customers will be advised when this app is available.


* We recommend setting the lower limit speech and visual warning threshold at 20% to 25% lower than cold inflation pressure. Due to software limitation,this is not possible with

tyre cold inflation pressures of > 45psi to 48psi respectively.

You'll still get accurate pressure readings whatever your tyre pressures or settings.


Speech and visual warning upper limit range:

40.6 to 92.8 psi (2.8 to 6.4 bar)

Speech and visual warning for rapid air loss:

unlimited pressure range)


Speech warning, where applicable: American English


Tyre pressures are displayed for up to four tyres


Pressure units used for screen display :

selectable psi, bar, kPa


Number of sensors supported: 2 to 4


Battery level warning

Stay safe

 'WiCap' and 'Boo9' are trademarks of Boo9 Limited. © 2019 Boo9 Limited