Product model: Loop-01 Chip model: AIRHO AB1536 BGA74 Bluetooth protocol: HSP / HFP / A2DP / AVRCP Bluetooth version: V5.0 Working distance: 10 meters Impedance: 16 Sensitivity: 95db Speaker diameter: 6mm Sound unit: Hi-Fi Speaker Frequency: 2400-2480MHz Support system: IOS / Android / Windows Talk time: 3.5 hours Music time: 4 hours Standby time: 3 months Charging time: 1 hour Charging bay battery capacity: 400mAh Headphone battery capacity: 40mAh Battery type: polymer lithium battery Charging voltage: 3.7V Charging port: Micro 5pin Weight of a single headset: 3.8g Packing list: earphone*2, charging compartment*1, manual*1, ear cap*8, data cable*1