Feature: 1. There is an LCD display, natural speaking voice audio, and a non‑directional noise‑cancelling microphone. 2. Large 40mm speaker unit driver combined with magnets provide stereo sound, powerful bass, clear sound and crisp high sound. 3. This headphone is very comfortable to wear,ear‑mounted ergonomic design ensures lasting comfort. 4. The foldable headband is not only designed to save space on your desk, it can also be placed in the accompanying carrying case. 5. Suitable for wireless connection equipment, 3.5mm wired connection equipment PC/mobile phone,studio, etc. 6. Built‑in 500mAh battery, wired mode can also be used as wired earphones through the provided audio cable, so the earphones will never be powered off. Specification: Item Type: Bluetooth Headset (Delivered with Built-in Battery) Material: ABS Built-in Lithium Battery: 500mAh Speaker: 32Ωx2 Charging Voltage: 5V Bluetooth Version: V5.0 Transmission Distance: 10m/32.8ft Working Voltage: 3.7V Distortion: ≤1% Signal to Noise Ratio: 85~100dB Talking Time: 8h Playing Time: 10h Charging Time: 2.5hApplication: Wireless Connection Equipment, 3.5mm Wired Connection Equipment PC / Mobile Phone,Studio ,etc. . Package List: 1 x Headset1 x Data Cable1 x Connection Cable1 x Manual