20 Hours of Battery Life for the Headphone GO TUNE WH06 Dual Connection Headset Comfort and Robust Operation Version 5.3 of Bluetooth has an effective range of ten meters. 40mm unit driver; 105 ± 3dB speaker sensitivity Speaker Rhythm In response: 20–20 KHz Sensitivity of the microphone: -42 ± 3dB Microphone Omnidirectional Microphone Direction Resistance: 2.2 Ω 20 hours or more of battery life; approximately two hours for charging 205.5g in weight