Description: This headphone is built in smart charging IC. It can automatically control the charging current, which will never burn out your phone, and also built-in a magnet set, no wire winding, no linger afraid of finding the headset. Headset with full charging support you 1.5 hours of calling. small size and ergonomic design with soft ear buds offer you a comfort wearing. It can provide stereo acoustic experience and connect with two mobile phones. It has strong compatibility with almost all bluetooth devices, like iPhone /Samsung /Huawei /Xiaomi /HTC.Specifications: Name: H9 Ring Bluetooth Headset & Magnetic Car Charger. Operation range: Up to 10 meters. Bluetooth version: V4.1. USB Port: DC5V2.4A / 5V1A or 5V2.1A. Talking time: 1.5hours. Battery capacity: 20mAh. Profile support: HSP, HFP, A2DP, ACRCP. Input: DC 12-28V. Transimisson range(Hz): 2.40GHz-2.48GHz. Charge time: about 1.5hours. Main material: Aluminium alloy. Function Key: Power on / off, Answer / Hangup / reject, Play / pause.