Citrea Smartwatch X00A-001VY Mens Watch Strap material: silicone (replaceable) Strap width: 18.5mm Strap Color: Black Closure: pin buckle Total length of the clock: 25.5 cm Case Shape: Rectangular Housing material: plastic Case size: 35 x 48 x 11 mm Case Back Material: Plastic Housing color: black Glass: plastic Water resistance: 3 bar Weight: 35 g Screen: 1.3 inch TFT-LCD, full-screen touch screen Compatible OS: Android 6.0 or above / iOS 9.0 or above Battery life: 8 days Charging time: about 2.5 hours Operating temperature: 0 °C to + 45 °C Charging temperature range: 10 °C to + 45 °C Bluetooth version: Bluetooth 4.2 Max. Output Power: -0.75dBm (0.84mW) Radio frequency: 2402 á 2480 MHz Functions: Compatible with smartphone, message notification, call notification, stop function, distance meter, color display, backlight, light, alarm function, heart rate monitor, blood pressure, heart rate, sleep recording, sleep duration and sleep quality, calorie counter, pedometer, date display Supplied with box and instruction manual.