Headphone for Smartphone and Tablet

Features: Bluetooth version: 4.1 Bluetooth profiles: HSP, HFP, A2DP and AVRCP Operating distance: 10m Speaker Sensitivity: 113 db (+/-5 db) Microphone Sensitivity: - 40db Battery built-in: 400mAh Standby: about 125h Working time: about 6h Interface: jack 3.5mm Package Included: 1x Headphones bluetooth 1x AUX cable 1x USB cable 1x User manual