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The use of NSD Swim implies compliance with the safety instructions described in the operating and maintenance guide. Read and understand all instructions before using this product. Failure to follow all instructions listed below may result in electric shock and / or serious personal injury.

NSD Swim is waterproof, but DO NOT soak it in water. Bluetooth will not work under water.

Read and understand all instructions before using this product. Failure to follow all instructions listed below may result in electric shock and/or serious personal injury.



  • Do not allow to be used as a toy. Close attention is necessary when used by children.

  • Do not abuse, stand on or take apart the device.

  • To reduce the risk of electric shock, do not charge NSD Swim and your smart phone in rain or wet location.

  • Do not tie the cord to any appliances, streetlamp, electric pole or anything that may cause electric leakage. Improper connection of the device can result in a risk of electric shock.

  • Do not tie the cord to any removable items like a rock, a chair, a table, etc. near the pool. This will result in you pulling the item into the water and will jeopardize yourself and other swimmers.

  • Station your smart phone at a safe and dry place.

  • Cover the recharging port with its cover at all times except when it is charging.

  • When not in use, NSD Swim should be stored indoors in a dry place.

  • NSD Swim and the NSD Swimmer App are specifically designed for use in resistance swim training only.

  • NSD Swim and its accessories do not prevent drowning.

  • NSD Swim and its accessories are not floating devices under any circumstances.



  • Transmits real time data to your smart phone

  • Views your pace, time, efficiency, and more

  • Verbally reminds you in real time your remaining distance

  • Compatible with Apple Health App


Design Details:

  • Intuitive, rugged design for long-lasting use

  • Built-in Bluetooth enables connectivity to the NSD Swimmer App to select modes and settings

  • Bluetooth: v4.0 LE

  • Working distance: Up to 25 Meters / 82 feet

  • Lithium ion battery (included) capacity: 3.7V 450 mAh

  • Electric specification: DC 5V

  • VCC supply power to CUP: 3.3V

  • Battery charging time: 2 hrs

  • Working time: 10 hrs

  • Standby time: 6 days

  • Item weight: 5.2 oz


Included in the box:

  • Two cords

  • Floating belt

  • NSD Swim device

  • USB charging cable

  • User Guide


Additional Requirements:

  • A Smart Phone equipped with Bluetooth v4.0 (or higher) and Android 5.0 or iOS 9 system (or later)

  • A free downloaded App - NSD Swimmer

  • A tripod or holder for Smart Phone video shooting

  • A swimming pool (Suggested minimum depth of 1 meter or 3.3 feet)


Training Advice:

Before you begin to train with NSD Swim, to prevent injuries consult and inform your doctor about your training strategy if you have not been physically active for a long period of time. Training with NSD Swim equipment involves using your whole body. Make sure to stretch and warm-up before starting your training session. Begin with low intensity exercises that will not tire you out. Start with 10 to 15 minutes of training per day and gradually increase the duration after a few weeks. It is recommended that you have at least one recovery day, preferably two, every week. Avoid or modify any exercises that cause you discomfort. Do not ignore your body’s warning signals of fatigue or pain. If you become extremely tired after a training session, stop and take a rest as you may be doing too much. Stay hydrated during all training sessions. At the end of each exercise, slowly reduce the intensity to cool down, then finish off with stretches to reduce muscle soreness and stiffness.



Make sure you have downloaded the free NSD Swimmer App through App Store or Google Play on your smart phone. It is required to pair your smart phone with the NSD Swim training aid.


Make sure the batteries in your smart phone and NSD Swim are fully charged and that the charger is disconnected before using.

To charge NSD Swim, please remove the white silicone water-resisting cover on the side of NSD Swim as shown in Figure 1. Charge it by using the enclosed USB charging cable. It takes about 2 hours to get NSD Swim fully charged (when the red light turns off). After charging, put the cover back on to remain water resistant.

Figure 1

NSD Swim

Maintain the power of NSD Swim: Please be advised that the NSD Swim is required to recharge every 90 days if it is used less frequent. It should be recharged every day when NSD Swim is used frequently.

Activate connection: First, turn on the Bluetooth through the Settings in your phone. Pull the rings at the two ends of NSD Swim with a force larger than 2 lbs and hold the force for 3 seconds. Now NSD Swim and the NSD Swimmer App in your smart phone should be automatically connected.

LED Indicator:

  • Flashing red light: Low power warning

  • Constant red light: Charging

  • Flashing green light: Connecting stand-by

  • Constant green light: Connected

  • Red light turns off: Charging finished



Gear Up:

Tie the two cords at the two ends of the NSD Swim device, the short cord is connected between NSD Swim and somewhere by the edge of the pool on a stable fixed item while the long cord is connected between NSD Swim and the swimmer's floating belt. There is no direction positioning the two ends of NSD Swim. However, NSD Swim should NOT be put into water (Figure 2).

Figure 2

NSD Swim

Tie one end of the cord to a stable fixed item near the edge of the pool as shown in Figure 3.

Figure 3

NSD Swim

In Freestyle, Breaststroke, and Butterfly, tie the other end of the cord on the floating belt at the center of the swimmers back as shown in Figure 4 and 5.

Figure 4

Figure 5

In Backstroke Style, tie the other end of the cord on the floating belt at the center of the swimmers front as shown in Figure 6 and 7.

Figure 6

Figure 7

Wear the floating belt and adjust the tightness to properly fit the swimmers stomach.


Open the NSD Swimmer App.

Pull the cord or swim for 3 seconds to activate and pair NSD Swim with the NSD Swimmer App on your smart phone. When it is activated you will see the green light turn ON. The flashing blue line will convert to a green line at the top of the App interface. This indicates the NSD Swim device and the NSD Swimmer App are paired and connected successfully. If there is no response on the NSD Swimmer App, please check the Bluetooth settings in your smart phone or recharge the NSD Swim device.


training log


training log

To stop using NSD Swim, you may either turn off the Bluetooth through your phone Settings or press the Home Key to close the NSD Swimmer App. Now you should be able to see the green line on the App interface converted to a flashing blue line if you open the App again.

If the two ends of NSD Swim are not pulled for 5 minutes, then the device will be switched to Sleep mode to save power.

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