Relife RL-071B 4-in-1 optical fingerprint calibrator for Android Phones Huawei MI Oppo Vivo fingerprints repair. Relife RL-071B optical fingerprint calibrator used to solve mobile phone screen fingerprint failure. RL-071B fingerprint calibrator suitable for Huawei/MI/Oppo/Vivo to solve the fingerprints problem under the screen or poor input after screen replacement. Features: 1. Solve the problem of the fingerprint display under the calibration screen cannot be recognized after the screen is changed. 2. Suitable for Huawei/Xiaomi/Op/Vi to solve the problem of the fingerprints under the screen or poor input. 3. Use with software/tutorials, easy to use, no cumbersome steps. 4. Solve the problem of screen fingerprint failure after the mobile phone is replaced. 5. 4 IN 1 fingerprint calibrator, no disassembly calibration, convenient and fast. 6. Easy to operate. 7. Quick calibration. 7. Small and portable.