Use Recommendations for PvR

1. Important Notice

As a professional voice encryption device, PVR Bluetooth Voice Encryptor (Hereinafter referred to as”PvR” ) can effectively protect the privacy of your call, but the sound quality of the encrypted call maybe not as good as the original voice; In addition, the sound quality of PVR is also affected by factors such as mobile phone voice enhancement function, cellular network signal strength, voice coding conversion of electromagnetic interference, data network latency or jitter, packet loss, etc., so we cannot guarantee that you can get the best sound quality under any circumstances. Before purchasing or using this product, please read this article carefully. If you have any questions, please feel free to contact us!
Tel: 86-10-88334733

2. Applicable Phone Model

Brand
Model
iPhone iPhone 8/X/XR/XS/11/12…
HUAWEI Mate20/Mate30/Mate40…P30/P40…
SAMSUNG Galaxy S10/S20/S21…Galaxy Note10/20…
VIVO X50 Pro+,X60 Pro+
XIAOMI Xiaomi 9/10/10S/11/11Pro/11Ultra,Redmi K40/K40 Pro
OPPO Reno5 Pro+,Find X3…
ZTE Axon 10 Pro, Axon 30 Pro/Ultra
ONEPLUS OnePlus 8/8Pro/8T,  OnePlus 9/9R/9Pro
HONOR Honor20/20 Pro, Honor30/30 Pro

3. Select SIM Card

Please choose the SIM card that uses UMTS network or supports Volte function. Generally, it is recommended to enable Volte function for better performance.

4. Use Suggestions For Encrypted cell calls

To obtain better sound quality of encrypted calls, please try to follow the following suggestions:

  1. While making an encrypted call, please turn off WLAN as much as possible.
  2. For dual-card dual-standby phones, the SIM card used for making encrypted calls should be set as the preferred SIM card for the mobile data network.
  3. In areas with relatively large electromagnetic interference, such as roadsides, stations, airports, etc., the mobile phone should be as close as possible to the PvR when making an encrypted call.
  4. When making an encrypted phone call in a noisy environment or while walking, please try to speak calmly and at a lower speed.
  5. PvR cannot be used while charging.

5. Voice Message Encryption Function Support

Android iPhone Encrypted Voice Quality
WeChat normal
Skype good
WhatsApp good
Line good
Telegram good
iOS Voice Memos good

6. Use Suggestions for Encrypted Voice Messages

  1. Indicator light “SEC” will start flashing after 3 seconds since the time of switching from encrypted call mode to encrypted voice message mode.
  2.  When sending a voice message and before starting to speak, please wait 1~2 seconds after pressing the record button. And delay 1~2 seconds to release the record button after ending the speech, so as to ensure the integrity of encrypted voice message.
  3. Please turn off WIFI if the sound quality is in poor condition.
  4. Do not speak directly to the microphone hole of the PvR, so as to avoid the deterioration of the encrypted voice quality caused by the airflow.
  5. If there is a stuck or loss of sound, please try to play the voice message repeatedly.

7. Limitations

  1. PvR can support most of the high-end models of mainstream brand mobile phones, but it does not rule out that some models of mobile phones do not match this product due to their audio characteristics or Bluetooth communication characteristics, resulting in poor sound voice quality.
  2. PvR doesn’t support CDMA or CDMA2000 network.
  3. Since PvR is connected to the mobile phone via Bluetooth, the Bluetooth signal is very susceptible to external electromagnetic interference (especially the 2.4G WiFi signal), which will cause worse sound quality. Therefore, it is recommended that the user turn off the mobile phone WLAN and shorten the distance between the phone and PvR as much as possible during the encrypted call.
  4. As the network conditions and technical status of mobile operators in various countries vary greatly, we can’t guarantee that PvR can make cross-border encrypted calls between all countries, nor can we guarantee that PvR can make roaming encrypted calls in all countries. When the sound quality of  cross-border or roaming encrypted call is not good enough, you can try to use VoIP for encypted call. It is recommended to use the “WhatsApp” communication tool.