Description; 16 HOURS PLAYTIME: The 500mAh battery was built-in neckband part, it could provide up to 16 hours playtime by only charging 1.5 hours. Kindly note not to use current over 5V1A to charge it. SECURE FIT AND COMFORTABLE: This Bluetooth headset is made by liquid silicone rubber, portable and dont have a twisting issue. With 38mm(14.9inch) length cable, you could feel comfortable to wear without facing embarrassing issues of a short cable. DEEP BASS WITH SMOOTH TREBLE: The updated CSR8645 chipset, special to adjust the sound area in the bass, try our best to make punch bass, and ensure the clear treble. You could enjoy aptx stereo sound while running, walking, hiking or other sports activities. CLEAR PHONE CALLS: Built-in EMC mic with CVC6.0 noise cancellation technology reduces several surround noise and ensures a clear voice to transfer to the one you call. WIDE COMPATIBILITY: Stable Bluetooth Connection will let you enjoy high fidelity sound without latency. With Bluetooth 5.0 technology, it could transmit Bluetooth signal reliable and fast. Also, it could be compatible with iOS and Android System. Dudios provides 12 months guarantee, any issues, feel no hesitate to Contact us. Brand Name: STEVVEX Headphones Model Number: ST104245JCY Vocalism Principle: Balanced Armature Control Button: Yes Active Noise-Cancellation: Yes Communication: Wireless Volume Control: Yes Style: Neck-mounted Sensitivity: 123dB Wireless Type: Bluetooth Is wireless: Yes Max Output: 0mW Line Length: 0.6m Support APP: No Function: for Video Game Function: Common Headphone Function: For Mobile Phone Function: HiFi Headphone Function: Sport Number Of Drivers: 2 Plug Type: Line Type Package List: User Manual Impedance Range: up to 32 Ω Connectors: None Earcups Type: Semi-open Headphone Pads Material: Silicone Bluetooth Version: 5.0 Codecs: AAC Support Memory Card: No Driver Diameter: 20mm Resistance: 32Ω Waterproof: Yes Frequency Response Range: 20 - 22000Hz Total Harmonic Distortion: 0% With Microphone: Yes Features: Waterproof Charging Method: CABLE Magnet Type: Other Function 1: Sports bluetooth earphone with microphone Function 2: IPX4 Waterproof Wireless Earphone f Function 3: Bluetooth V5.0 Earphone  Function 4: In-ear Bluetooth Earphone for Running Fitness Function 5: HI-FI Sound Earphone fro Xiaomi 9 8 7 Function 6: Strong Bass Bluetooth earphone  Function 7: Sports stereo Bluetooth earphones  Function 8: Big power Bluetooth Earphone  Function 9: Wireless Earphones  Function 10: 1h Fast Charging Could Use 12 Hours