1. un38.3 is mainly a test for lithium batteries.
2. There are 3 shipping methods for Un38.3
1. pi965 is a separate version of the lithium battery Shipping
2. The Pi966 comes with the battery and the product (but the battery is removable)
3. The Pi967 has a battery installed inside the product (it cannot be removed)
What UN38.3 includes:
1. Freight
2. Sea freight
3. Test report
< strong > > 4. Test summary
5. MSDS (you can make the individual finished products yourself)
6. 1.2 one meter drop (only shipping method 965 is required)
Note: Pay attention to TW Bluetooth headsetsS,
1. Pay attention to its The batteries of both earphones are the same,
2. It depends on whether its headphone compartment and earphones called for a38.3
3. You need to do a38.3 on both.
I want to buy TWS true wireless Bluetooth headphones, but my ears are relatively small and I have tried several models but they are not stable. Have you got some. recommendations ?
I recommend several Bluetooth headsets that have wearing requirements
1. Nanka N2 True Wireless Bluetooth Headphones
NineKa Nanka Bluetooth headsets are very popular recently. rated by major digital media as the “most cost-effective” Bluetooth headsets in 2019. Their Internet celebrity temperament and outstanding sales have once again been sublimated and affirmed. In the final analysis, it is because helmetsNINEKA Bluetooth devices can well meet consumers' needs and imagination in terms of sound quality, workmanship, battery life, functions, etc. In order to ensure the quality of the earphones, NineKa Nan card earphones go through more than 30 processes from material selection to cutting, shaping, grinding, etc. to create a unique product.
This NineKa headset from South Carolina is well known in the industry for its comfort and high sound quality. Although still in the testing phase, he has established a high-level acoustic laboratory and hired William, a. musician from Toronto, Canada. Arnaldo worked with 20 European and American tuners for two years to make millions of adjustments for different music styles, making the sound quality highly restored to the original sound, presenting a strong and wide sound range, making the treble dynamic. and the rich and powerful bass,comparable to the effect of thousand dollar headphones. And because of its convenient operation, high comfort, low power consumption and long battery life, it is loved by many students, skateboarders, travel enthusiasts, running enthusiasts and cycling and digital experts.
2. Audio-Technica ATH-CKR7TW Bluetooth Headphones
Audio-Technica ATH-CKR7TW true wireless Bluetooth headphones inherit the design essence of Tiejia's CKS and M series in the past two years. and is of high quality. The ABS engineering plastic material and large Audio-Technica logo are sleek and stylish. The Freebit ergonomic structure also makes it more stable to wear. In terms of configuration, it adopts Bluetooth 5.0 protocol, has a built-in high-quality DAC module, and can support aptX and AAC encoding. It can be considered as a true wireless headset with the propertieshighest acoustic tees.
3. Apple Airpods
Before the release of AirPods, there were only wireless Bluetooth headphones on the market; but after the release of AirPods, wireless headphones truly became “wireless headphones”. And all this is due to a unique chip - W1, which brings far more convenience than sound quality, and realizes three main functions that ordinary wireless earphones cannot match: fast pairing, stable connection and low power consumption. ultra low energy.
If you own an iPhone, iPad, and MacBook simultaneously, when you switch devices daily, AirPods will immediately connect to the nearest electronic device for pairing and seamlessly switch between a moment ; W1 chip also makes AirPods Bluetooth connection more stable, not only is it not easy to disconnect, but also has extremely low latency, it does notso there will be no feeling of lag when gaming, standby power consumption of AirPods is; managed via the W1 chip, which is also two or three times more powerful than ordinary Bluetooth headsets.
4. Sennheiser Momentum True Wireless
The Sennheiser earbuds themselves can provide 4 hours of use, and the portable charging case can provide an additional 8 hours of power for the earbuds, thus a total of 12 hours of The use is obtained, which poses almost no problem for long-term wearing or short-distance travel.
To ensure high sound quality, Sennheiser has also equipped MOMENTUM True Wireless with Qualcomm's aptX codec technology. According to actual tests, it can be used daily for listening to music, playing games, watching TV series, etc. . no problem.