Features: - In-ear design, comfortable to wear, not easy to fall off. - Bluetooth chip 4.2 , signal stability, automatic matching, strong compatibility - Portable charging box, comfortable to master, no shortage of electricity during travel - Double-ear separated design makes single and double ears can be switched at will - IPX5 waterproof design makes music not afraid of the sweaty sports - 1500mAh polymer lithium battery , can continuously charge the earphone about 10 times Specification: - Bluetooth chip: WT2000u (BES) - Bluetooth version: V4.2 - Bluetooth features: A2DP, HFP, HSP, AVRCP, SPP - Back distance: 10 meters - Music time: 3H - Call duration: 2.5H - Standby time: 220H - Charging time: 1.5H-2H - Headphone battery: 50mAh - Charging battery: 1500mAh - Output power: 3mWx2 - Charging connection: Micro USB - Speaker: 16ohm/?6mm - Microphone: Silicon Mai – 42 ± 3 dB - Charger voltage: 5V +/- 0.25V What's in the box 1 x Joyroom JR-T05 Earbuds 1 x Charging cable 2 x Ear tips 1 x User Manual