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I'm looking for an IoT device which has Bluetooth, GPS, a USB port and which can support a module for an alarm. The end product is a wearable device therefore the device should be small.

It should be something like an Arduino or a Raspberry Pi. The size should be as small as possible but it should be compatible with all the above mentioned features.

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    What sort of device are you specifically looking for? To be able to answer this, you should really specify exactly what type of device you want (do you want a board that you can program and put into a case?). Do you also know more exact dimensions that you need to help narrow down the search? – Aurora0001 Apr 18 '18 at 18:05
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SIMCOM SIM808 module seems to meet the requirements for your device.

Bluetooth: compliant with 3.0+EDR

Specification for GPS

Receiver type

  • 22 tracking /66 acquisition -channel
  • GPS L1 C/A code

Sensitivity

  • Tracking: -165 dBm
  • Cold starts : -147 dBm

Time-To-First-Fix

  • Cold starts: 30s (typ.)
  • Hot starts: 1s (typ.)
  • Warm starts: 28s (typ.)

Accuracy

  • Horizontal position : <2.5m CEP

USB interface

Moreover, as you are planning for a wearable device, it offers following advantages:

  • Dimensions: 24.0*24.0*2.6mm
  • Weight: 3.30g
  • Low power consumption
  • Supply voltage range 3.4 ~ 4.4V
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    Side note: special attention should payed when buying this module, because some of them has only GSM/GPRS support by default and firmware upgrade is needed to enable Bluetooth or/and GPS functionalities. – Bence Kaulics Apr 20 '18 at 15:27
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Shameless plug In about a years time you can get an nRF91 + nRF52840 combo. LTE(CATM1 and NbIoT), GPS, BLE, USB, 802.15.4, etc, that uses a fraction of the power of current devices, and got plenty of µC-resources to spare.

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