The U-PROX Tag works exclusively with U-PROX SL and U-PROX SE readers and can be used in two modes — button-only mode or active chip with button mode.
Button mode:
In this mode, the U-PROX Tag transmits the chip code to the reader only when the button is pressed.
Active tag mode:
In this mode, the U-PROX Tag periodically transmits short information about itself and its readiness to communicate with the reader every 0.9 seconds. After receiving this information, the reader calculates the distance to the U-PROX Tag. If the distance matches the reader’s configured range and the reader has not yet interacted with this U-PROX Tag, data exchange occurs between the reader and the tag. The reader then sends the tag code received from the U-PROX Tag to the access controller.  
Technical Specifications:
| Code length: | 8 bytes | 
|---|---|
| Communication: | 2.4 GHz, up to 12 m, secure two-way communication with a 256-bit key | 
| Reading range: | up to 12 m (configurable via the reader) | 
| Battery: | CR2032 battery, 3 V | 
| Battery life: | up to 1 year | 
| Operating temperature range: | –10 °C to +40 °C | 
| Dimensions: | Ø 39 × 9 × 57 mm | 
| Weight: | 12 g | 
| Housing color: | white | 
| Housing material: | plastic (ABS+PC) | 
| Package includes: | U-PROX Tag, CR2032 battery (pre-installed), user manual | 
Supports 125 kHz ASK and FSK, MIFARE® Classic, MIFARE® PLUS S/SE/X/EV1 with AES encryption, DESFire® EV1/EV2/EV3 with AES encryption. Compatible with Wiegand or OSDP, configurable via mobile application. Suitable for use with Paradox ACM12 access control module (26-BIT WIEGAND).
Supports 125 kHz ASK and FSK, MIFARE® Classic, MIFARE® PLUS S/SE/X/EV1 with AES encryption, DESFire® EV1/EV2/EV3 with AES encryption. Compatible with Wiegand, configurable via mobile application. Suitable for use with Paradox ACM12 access control module (26-BIT WIEGAND).
Supports 125 kHz ASK and FSK, MIFARE® Classic, MIFARE® PLUS S/SE/X/EV1 with AES encryption, DESFire® EV1/EV2/EV3 with AES encryption. Compatible with Wiegand or OSDP, configurable via mobile application. Suitable for use with Paradox ACM12 access control module (26-BIT WIEGAND).
Supports 125 kHz ASK and FSK, MIFARE® Classic, MIFARE® PLUS S/SE/X/EV1 with AES encryption, DESFire® EV1/EV2/EV3 with AES encryption. Compatible with Wiegand, configurable via mobile application. Suitable for use with Paradox ACM12 access control module (26-BIT WIEGAND).