40H Long Usage Time Hi-Fi Wireless Headphone delivers crisp, balanced sound with reliable wireless performance for work, study, travel, and workouts. Designed for all‑day comfort, it pairs quickly, holds a stable connection, and keeps you focused with clear audio and an ergonomic fit. Perfect for music, calls, and meetings. Key details: Wireless version: 5.3+EDR compatible Speaker size: 40mm; Wireless distance: 10m Talk time: 15H; Standby time:90-180 day Charge time: 3H（ Type-C） Battery:DC3.7V/ 400mAh; Frequency range: 2.402GHz -2.480GHz Frequency response: 20hz-20khz; Supports wireless protocols: AVRCP 1.0/GAVDP 1.0/AVDTP 1.0/A2DP 1.0.