Up to 70 hours of wireless listening Ø40mm drive unit provides high definition sound quality Support for Bluetooth standard specification Ver.5.0 Support AAC and SBC encoding Simple and comfortable over-the-ear design Lightweight body, easy to carry https://i.imgur.com/3leP5jK.jpg 【Product specifications】 【system】 NCC type certification number: CCAJ18LP1800E0 【headset】 Type: Closed moving coil type Drive unit: Ø40mm Output sensitivity: 99dB/mW Frequency response: 5 ~ 35,000 Hz Input impedance: 32Ω 【microphone】 Type: back pole type capacitor Pointing feature: omnidirectional Sensitivity: -44dB (1V/Pa, at1kHz) Frequency response: 100~10,000Hz Power type: DC3.7V lithium polymer battery (built-in) Charging time: about 4 hours Battery life: continuous communication for up to 70 hours Operating temperature range: 5 ° C ~ 40 ° C Weight: about 190g Accessories: USB cable for charging (30cm/USB Type-A/Micro USBType-B) [Product Warranty] Non-human damage to the original factory warranty for one year [Returns need to know] 1. According to the Consumer Protection Law, consumers are entitled to the seven-day appreciation period of the goods (the non-trial period of the appreciation period) Headphones are classified as personal hygiene products. They should be purchased as they are unpacked. Be sure to think twice before ordering or unpacking, so as not to affect your rights. 2. The return limit is brand new and unopened. 3. In case of new products, please inform the customer service to handle it for you. 4. For new products, please keep the outer packaging and contents and accessories intact. If the packaging carton is dirty or severely torn, it cannot be restored. Or the accessories are missing and cannot be exchanged. 【Precautions】 1. Bluetooth headset related time varies depending on personal use, phone settings and ambient/temperature 2. Due to differences in computer screen settings and personal perception, the product images of this store are for reference only, subject to the actual product received. 3. If the product specifications are incorrect, they will be based on physical objects. 4. Please follow the operation instructions and precautions in the product manual before use. 5. If there are any errors in the above specifications, the information published by the original factory shall prevail.