---
title: BioDrive® Signal Is Weak or Stops Mid-Session
description: Fix weak or lost BioDrive® signals in Shiftwave. Step-by-step instructions for sensor placement, hand position, and connection checks.
---

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# BioDrive® Signal Is Weak or Stops Mid-Session

If BioDrive® loses or shows a weak signal during a session, work through these steps.

#### **Step 1: Finger Sensor Fit & Placement**

1. Place the pulse oximeter fully on the finger (snug, not tight).
2. Warm your hands, cold fingers reduce signal quality.
3. Keep your hand relaxed and still on the armrest.

#### **Step 2: Re-seat the Sensor**

1. Remove the sensor from your finger, wait 5–10 seconds, re-apply.
2. If you see an indicator on the control/app screen, confirm it’s receiving a pulse.

#### **Step 3: Stable Breathing**

- Breathe in a smooth rhythm (slow inhale, longer exhale) to help stabilize readings.

#### **Step 4: Cable & Power Check (Control Box / Pro)**

- Ensure sensor cable is fully inserted into the ShiftLink and control knob.
- Check chair power and, for Pro, that ShiftLink and USB-C cables are fully seated.

#### **Step 5: Restart BioDrive®**

- Toggle BioDrive® off → on in the app or via the control box button.
- If needed, restart the session.

#### **Step 6: Try Another Finger**

- Some users get better signal on the index or middle finger of the non-dominant hand.

### **After You Fix It**

Run a short BioDrive® session and watch the indicator, steady tracking should hold for the full session.

### **Still Need Help?**

If signal remains weak, [contact Support](https://shiftwave.co/pages/support) and we will be here to help.

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