chip: RTK8762+JieLi TWS Compatible system: Android4.4 and above, IOS8.2 and above Flash: 128M+64M Screen: TFT Screen size: 1.3 inch Resolution: 360*360 heart rate chip: HX3603 Bluetooth: BT5.0 WIFI: NO NFC: NO Battery type: Polymer lithium battery Capacity: 350mAh Charging method: Magnetic charging Exercise: Pedometer, calories, health sport mode: blood pressure, heart rate, blood oxygen, sleep reminder sedentary, sleep monitoring, etc. Social sharing: Wechat, QQ, LINE, Facebook, Twitter, KaoKao Talk, WhatsApp, Skype, etc. other: raise your hand to brighten the screen, call reminder, SMS reminder, alarm clock, remote camera, find the phone, etc. waterproof: IP67 Charging time: 2h Standby time: 7~9D App language: Chinese, Traditional Chinese, English, Japanese, Korean, German, Russian, Spanish, Italian, French, Portuguese, Arabic, Czech, Greek , Persian, Dutch, Polish, Finnish, Swedish, Thai UI language: Chinese, English, German, French, Italian, Spanish, Japanese, Polish, Russian, Portuguese (default English) Sport mode: walking, running foot, climbing, cycling, elliptical machine, yoga, basketball Appearance material: stainless steel bezel + plastic middle frame + stainless steel battery cover Strap material: TPU Number of buttons: 2 buttons Bluetooth name: LEMD1 chip: JIELI: 6956A speaker impedance: 1615% Drive unit: 6mm Frequency range: 20Hz~20KHz Sensitivity: receiving sensitivity 953dB rated power: 8mW (single) distance: about 10m BT: V5.0 Music time: about 3h Call time: e about 2.5h Standby time: 72h Charging time: 1h battery capacity: 25mAh material: ABS size: 24*18*12.6mm