C7 72-Hour Ultra-long Playtime】The TOZO NC7 earbuds are compact and exquisite in design, comfortable to wear. Despite their small size, they are equipped with a large 70mAh lithium battery and consume ultra-low power, allowing them to achieve 18 hours of playback time on a single charge and up to 72 hours of ultra-long playback time when used with the wireless charging case, and it support USB-C fast charging and wireless charging. 【Active Noise Cancellation】Hybrid 3 layer Active Noise Cancellation. 1. Outward-facing microphone detects external sounds and counter with equal anti-noise to first cancel noise. 2. Inward-facing microphone listens inside ear canal to pick up internal sounds and produce anti-noise again to twice cancel the left noise. 3. Ear caps prevent 90% noise going to ear canal. 【Transparency Mode】With the transparency mode, you can hear what you want to hear, which lets outside sound in so you can hear and interact with the world around you. You can clearly hear the announcement of the airline or subway and what is saying around you without taking off the headphones. 【Optical Sensor Technology】 The earbuds utilize optical sensor technology, which allows them to automatically pause playback when removed from your ears. They also feature high-precision touch sensors that have been optimized for everyday use and active lifestyles, continuously detecting their wear status in real-time. 【Professional ORIGX 2.0 Technology】The professional ORIGX 2.0 technology further optimize the performance of vocals and mid-range, delivering more distinctive immersive and realistic sound through clear layers and extremely rich vocal music details. 【Support TOZO APP】TOZO APP offers quick and easy access to Active Noise Cancellation mode and EQ mode switch, as well as the ability to save noise reduction intensity customized adjustment and EQ curve settings. It can be used to customize Gesture operations and perform OTA software updates on the product. Where you can become acquainted clearly with the Quick Guide and Product FAQ. 【Built-in Dual Noise Cancelling Microphone】Double microphone noise reduction system suppresses environmental noise. A dedicated internal and two external microphones pick up your voice and isolate it from outside noise.