Kalsten | SP16 True Wireless Earbuds with Ear Hooks, Waterproof Sports Headphones with Mic and HiFi Stereo Sound
Break Free from Tangled Wires
Imagine… getting ready for your workout only to waste time untangling cords or dealing with earbuds that slip out. These true wireless earphones eliminate the hassle by combining a secure ear hook design with reliable Bluetooth connectivity so you can move without restrictions.

All-Day Comfort and Stability
The lightweight ear hook design ensures a snug hold during running, training, or everyday errands. You get the freedom to focus on your activity while your earbuds stay comfortably in place.

Performance-Driven Features
Engineered for active lifestyles, these earbuds deliver HiFi stereo sound with deep lows and crisp highs. A built-in microphone makes hands-free calls clear, while the waterproof build helps withstand sweat and outdoor conditions.

Designed for Everyday Use
Crafted to balance durability with comfort, these earbuds bring together modern sound quality and a secure fit, making them a dependable choice for workouts and daily listening.

Why Choose Us?
- True wireless freedom with stable Bluetooth connection
- Secure ear hook design for active movement
- HiFi stereo sound with balanced audio
- Integrated microphone for clear calls
- Waterproof design for workouts and outdoor use
- Lightweight comfort built for extended wear
Free standard shipping on all orders. No minimum purchase.
- Ships to: United States
- Processing: 1–4 business days (Mon–Fri)
- Transit: 5–10 business days
- Total delivery time: 6–14 business days
- Order cut-off: 5:00 PM PST
You will receive a tracking number by email once your order ships. Please allow up to 48 hours for tracking to update.
See our full Shipping Policy.
You have 14 days from delivery to request a return.
- Email support@open.shop with your order number to start a return.
- Items must be unused, complete, and in their original packaging.
- Return label: flat $9.99 USD, deducted from your refund — nothing to pay upfront.
- Damaged, defective or incorrect items: we cover all return and replacement costs.
- No restocking fees.
- Exchanges: contact us and mention "exchange" — the new item ships once your return arrives.
- Refunds are issued within 7 business days of inspection.
See our full Return Policy.
Questions about your order or our products? We're happy to help.
Open
Hooizolder 214
Drachten Friesland 9205CD
Netherlands
Email: support@open.shop
Customer Service:
Monday to Friday, 8:00 AM – 6:00 PM PST (excluding public holidays)
We reply to all messages within 24 hours on business days. Weekend messages are answered on Monday.
For quick answers, visit our FAQ page or use our Contact Form.