Play music / talk time: about 3-4 hours Standby time: about 100 hours Battery Type: Rechargeable Polymer Lithium Battery Function: fast charging, high-definition call Voice: can switch between Chinese and English, linked to the state under the press 2 under the boot button Chip: CSR63120 top chip. HBQi7 TWS wireless independent Bluetooth headset Wireless Binaural Bluetooth Headset Display: Apple ISO system battery display Link: You can link two Bluetooth devices at the same time Bluetooth version: V4.2 Play music / talk time: about 3-4 hours Standby time: about 200 hours Battery Type: Rechargeable Polymer Lithium Battery Function: fast charging, high-definition call Voice: can switch between Chinese and English, linked to the state under the press 2 under the boot button Chip: CSR chip Please Take note: If only one ear piece is playing, double press any earbud switch and wait for connected voice response. For best battery life connect charger to usb port with earbuds inserted and leave for 2 hours. What's in the box 1 x i7s Wireless earbuds 1 x Charging station 1 x USB cable 1 x User Manual