General specifications

Property Specification
Switching Devices Up to 16A (domestic use)
Dimming lights LEDs (certain types) on 110V/240V or incandescent light bulbs
Measuring Current and voltage (5kHz)
Overview Energy usage (real-time for now)
Timer function Timer functionality
Communication Bluetooth Low Energy (BLE) 4.0 and up
Tracks Smartphones
Tracking accuracy 1.5-4.0 meter
Maximum range 20-70 meter
Proximity detection Requires 1 particular Crownstone “in sight”
Room-level presence detection Requires 4 Crownstones in sight (not necessarily per room)
Switchcraft function Simultaneous use with light switch (with tiny adaptation)
Network Bluetooth Mesh connects Crownstone-to-Crownstone
Chipset Nordic nRF52832, 64 kB RAM, 512 kB FLASH
Beacon function iBeacon
Energy consumption of device itself 250 mW
Soft-fuse function Limit extreme currents or switch off with unexpected behavior
Temperature function Switch off with extreme temperatures
Dimensions 51x46x13mm (LxWxH), 40 gram
Open-source Software available at
Mobile phones supported iOS and Android
Battery Not required!


You can find our products at:

Product Website link
Built-in One (1 unit) Built-in One
Built-in One (10 units) Starter Kit
USB dongle USB dongle
Hub Not required. Instructions to build your own coming soon

You can also find our products in high-end home automation shops.

More detailed list of functions

This is just a list off basic functions. Take a look at for more information. Some examples:

Property Specification
Authentication roles Admin, member, guest
Dumb house mode Convenient for parties or renting out your appartment
Voice assistant integration Alexa, Google Home, see “works with” page
Home assistant integration Through HACS, see manual
Smart watch integration Apple Watch (only control, not indoor positioning
Homey integration Coming soon (March 2021)
Smart lights Philips Hue coming soon
Instantanous power measurements Real-time power measurements arriving on phone
Reacting on close proximity Tap to toggle (a bit like NFC)
Reacting on moderate proximity Presence (at home or not)
Reacting on room-level presence Indoor positioning
User-controlled upload of data to the cloud See privacy settings in app (opt-in!)
Visualize other users in the app See privacy settings in app (opt-in!)
Send commands through the internet Restricted (depends on hub)
Scheduler Set timers and schedules
Smart timer Set timers only when dark, etc.
Location-based messages Send a message just when someone enters a room
Multiple users Only turn off the lights when everyone leaves a room
Firmware updates (new stuff!) Through the Crownstone app (approx. every 2-3 months)
Very large mesh Support for 255 devices in the Bluetooth Mesh

Examples of features that are currently worked on are the indoor positioning of wearables, the ability to run your own Arduino code on the Crownstones, and all kinds of integrations.