MINGLE BKT381 Multi-function Altimeter with Compass & Barometer & Thermometer, BKT381 Option:BKT381 Regarding the audio without sound

Regarding the audio without sound

REC button: press to record / stop

well controlled tightness

- Driver chip features Short-Circuit Shutdown for Large Output Current

Elegant and stylish design makes your mobile phone look new

MINGLE BKT381 Multi-function Altimeter with Compass & Barometer & Thermometer, BKT381 Option:BKT381 Regarding the audio without sound1. Bring pleasure in your climbing, hiking, skiing and other outdoor sports 2. Mechanical and battery free 3. Always makes you ready for weather changes with weather forecast function 4. With compass, thermometer and hook, satisfies all requirements in sports 5. Altimeter measuring range: 0 5000m 6. Barometer pressure range: 600 1000hPa 7. Temperature measuring range: 30 50 Degrees Celsius Specification: General Size 85*68*28mm Weight 90g Package