heart rate monitor watch with chest strap belt , equipment name: heart rate monitor watch with chest strap belttechnical specification: • battery type: 350 mah li-pol rechargeable battery • operating time: up to 13 h (continuous training) with heart rate and high accuracy gps recording, up to 20 h (continuous training) with heart rate and medium accuracy gps recording, up to 50 h (continuous training) in gps power save mode with heart rate, approx. 30 days in time mode • operating temperature: -10 °c to +50 °c / 14 °f to 122 °f • training computer materials: abs + gf, pc/abs plastic alloy, aluminum alloy, stainless steel, gorilla glass window • wrist strap and buckle materials: thermoplastic polyurethane, stainless steel, aluminum alloy • watch accuracy: better than ± 0.5 seconds / day at 25 °c / 77 °f temperature • gps accuracy: distance ±2%, speed ±2 km/h • altitude resolution: 1 m • ascent/descent resolution: 5 m • maximum altitude: 9000 m / 29525 ft • sample rate: 1s in high accuracy gps recording ,30 s in medium accuracy gps recording, 60 s in gps power save mode • accuracy of heart rate monitor: ± 1% or 1 bpm, whichever larger. definition applies to stable conditions. • heart rate measuring range: 15-240 bpm • water resistance: 30 m • memory capacity: 60 h training with gps and heart rate depending on your language settings • display resolution: 128 x 128