JetXFit™ H8X Blood Pressure Monitor Smart Watch

The heart rate monitor is based on the latest technology called photoplethysmography. It is the use green LED lights paired with light‑sensitive photodiodes to illuminate your skin and measures changes in light absorption.

This lets the device detect the amount of blood flowing through your wrist at any given moment. Because blood is red, it reflects red light and absorbs green light.

“When your heart beats, the blood flow in your wrist — and the green light absorption — is greater. Between beats, it’s less,”.

The sensor are designed to compensate for low signal levels by increasing both LED brightness and sampling rate. That’s why the heart rate sensor on the back of the device flashes its LED lights hundreds of times per second, helping the device calculate heart rates precisely.

But when it measures your heart rate every ten minutes, the Watch switches to using infrared light. And if it fails to provide an adequate reading while using the infrared light, the device switches back to the green LEDs.

In order for the sensor to work as advertised, the watch must be close to your skin. The company advises tightening the band in case the sensors aren’t reading your heart rate accurately.

All in all, the heart rate sensor in the watch is a great feature, especially if you’re something of a fitness buff. It checks your heart rate during workouts for an at-a-glance overview of both the intensity level and the heart rate change over time.

*DUE TO COVID-19, PRODUCTION, PROCESSING, & SHIPPING MAY BE DELAYED. THANK YOU SO MUCH FOR YOUR PATIENCE & UNDERSTANDING.*

Turnaround Time

All orders of in-stock items are typically processed within 3-5 business days.This is the process where your orders are being entered in our internal order system to create a work order for production or fulfillment requests depending on where the items you ordered are coming from.

Shipping and Delivery Time

Typically, after processing and/or production time, if fulfillment was from our US warehouse, ESTIMATED delivery time is about 7-12 business days from the day your order was shipped. Expedited shipping maybe available for these items.

If fulfillment was from the UK, Poland, Malaysia, or China, delivery times take about 15-25 business days (depending on your location) from the day your order was shipped due to the US Custom inspection process. Unfortunately, expedited shipping isn't available for these items. 

Orders may be canceled if they have not been processed and shipped. After they have been processed they may not be canceled. But this is a case-by-case basis. DO NOT hesitate to contact us at support@ohyeswehaveit.com -- we will always do our best to find a way to solve the issue at hand.

We use the following carriers to deliver our orders:

• USPS
• UPS (upon request)
• FedEx (upon request)
• e-Packet

Order Tracking

If a tracking # is provided by the shipping carrier, we will update your order with the tracking information. Please note that some orders using 1st Class USPS and e-Packet mail will not have tracking numbers or will have unreliable tracking information.

Shipping Rates

Shipping costs make shopping no fun. Don't you agree? So, we TRY our best to offer FREE shipping or low shipping rates as much as possible. The rate charged for the shipping of your order is based on the weight of your products, and your location. Before the final checkout page you will be shown the shipping option and what the cost will be, and you will have a chance to not place your order if you decide not to.