The TWS-I8X true wireless stereo earphone brings you extraordinary music enjoyment and allows you to have hands-free phone calls. Comes with a charging box to provide backup battery for your earphones, no worry that it will be out of power. Ergonomically designed earbuds enhance long-lasting wearing comfort and always keep earphone stable when you doing exercise. It is great for gym, running, jogging, hiking, cycling, etc. Bluetooth V4.1 for stable connecting and power saving Adopt True Wireless Technology, enjoy your wirelessly sports Charging box provides convenient charging for your earphones Strong compatibility, compatible with any Bluetooth enabled devices Compact and light-weight design Specifications: Bluetooth version: Version 4.1 Battery capacity: polymer lithium battery 45mAh Music time: About 2 hours Charging time: 1-2 hours Standby time: 120 hours Working current: 18mA Standby current: 4uA Frequency range: 2.4-2.485GHz Bluetooth level: Level 2 and 3 Modulation process: GFSK Max transmitter power: +2DBm Compatible with: iPhone, iPad and Samsung, HTC, etc. Bluetooth-enabled devices Package included: 1 Pair of TWS-I8X TWS True Wireless Stereo Bluetooth Headphone 1 x Charge Box 1 x Charging Cable 1 Pair of Earbuds Brand TWS Earbuds SKU 100420212_NP-1020724264 connector_1 3.5MM Wearing type In-Ear wireless_connectivity Bluetooth Model X9S- TWS