Haylou RS4 LS12 1.78 inch 368*448 pixels AMOLED Screen Heart Rate SpO2 Monitor 25 Days Standby IP68 Waterproof BT 5.1 Smart Watch Haylou RS4 LS12 1.78 inch 368*448 pixels AMOLED Screen Heart Rate SpO2 Monitor 25 Days Standby IP68 Waterproof BT 5.1 Smart Watch | 1931364 Price: USD 84.99