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Please read the instructions carefully before use. Product description:This computer uses a wireless digitally coded transitmission , reduces environmental2 Bike memory with 2 wheel size setting. 2. Maintenance programe,. 3. Current speed (0-99.9 km/m per hour). 4. Average speed (0-99.9 km/m per hour). Bicycle computer. SD-546C (16Functions). FUNCTIONS. -. SPD CURRENT SPEED. -. ODO ODOMETER （0.001～99999km/m). -. DST TRIP DISTANCE. -. MXS MAXIMUM SPEED.