Closed design with excellent sound insulation Clear and comfortable small earmuff design Enjoy a long listening experience with one charge Easy to carry folding storage design Music in a wireless playback device with Bluetooth technology Ø40mm drive unit with vivid and powerful sound Easily play music & answer calls Taiwan Iron Triangle company goods, enjoy the original one-year warranty service https://i.imgur.com/350kayZ.jpg https://i.imgur.com/vjEcQGv.jpg https://i.imgur.com/LBf9xGL.jpg https://i.imgur.com/XLR59Xl.jpg 【Product specifications】 [headphone section] Type: Closed moving coil type Drive unit: Ø40mm Output sensitivity: 102dB/mW Frequency response: 5 to 32,000 Hz Impedance: 32Ω [Microphone section] Type: back pole type capacitor Directivity: omnidirectional Sensitivity: -40dB (1V/Pa, at1kHz) Frequency response: 50 ~ 15,000 Hz [Communication Specifications] Communication method: Bluetooth standard specification Ver.4.1 Maximum communication distance: within 10m of good line of sight Communication frequency band: 2.4GHz (2.402GHz ~ 2.480GHz) Modulation method: FHSS Support Bluetooth protocol: A2DP, AVRCP, HFP, HSP Support code: SBC Support content protection: SCMS-T Transmission band: 20 ~ 20,000 Hz 【other】 Power: DC3.7V lithium polymer battery (built-in) Charging time: about 4 hours* Available time: continuous communication (when playing music): up to about 40 hours* Continuous standby: up to about 1000 hours* Weight: 190g Operating temperature range: 5 ° C ~ 40 ° C [Accessories] USB cable for charging (30cm, USB Type-A / Micro USB Type-B) *Depending on the conditions of use. [Product Warranty] Non-human damage to the original factory for one year (the warranty does not include earphone accessories) [Returns need to know] 1. In accordance with the provisions of the Consumer Protection Law, consumers are entitled to the seven-day appreciation period of the goods (the non-trial period of the appreciation period). Since the earphones are personal hygiene products, they should be purchased as they are unpacked. Please confirm before unpacking, so as not to affect them. Self-interest 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. New product 瑕疵 exchange, please keep the outer packaging and contents of the accessories intact, if the packaging carton is dirty or severely torn, can not be restored to the original state, or the accessories are lost, can not accept the exchange 【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.