450mAH high capacity polymer battery, Ultrasonic technology, safer,more durable. This GV18 wristwatch can be used as phone freestanding with SIM card ,Waterproof. Standby time:160Hours Music playing time:6 hours Talking time:3 hours. Entertainment: MP3, MP4, AVI format for local playback; Bluetooth music player. Remind: Apple system can't sync information and Bluetooth notice.
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