i-Tech 360 Voice Recorder: [Long-lasting Backup Battery]: Charge the device via Micro USB charger cable to the power adapter. It works for up to 5-6 hours when the battery is fully charged. ✅ [Automatic Connection]: The device will automatically connect to your number the moment it detects sound within its range. i-Tech 360 Voice Recorder: [GSM SIM Card]: Insert a GSM SIM card with a full cover into the device, and send an SMS from your phone to sync the device with your mobile number. The 32GB memory card (not included) can capture audio recordings for several months. ✅ [Easy to Use]: The device is easy to install, and does not require any installation software / cables / external battery