Features 5-digit large-screen display with low power consumption and long battery life. The input adopts the usual contact signal, the selection of the sensor is simple and convenient, and the count is accurate and reliable. Maximum counter speed reaches 20 times / sec. Both the panel and the outside can be zeroed. Anti-shock design to prevent data loss, no mechanical wear, reliable operation and long service life. Function: 1. 5-digit large-screen LCD display with low power consumption and long battery life. 2. The input adopts the usual contact signal, the selection of the sensor is simple and convenient, and the count is accurate and reliable. 3. Maximum counter speed reaches 20 times / sec. 4. Both the panel and the outside can be 0 cleaned. 5. Anti-shock design to prevent data loss, no mechanical wear, reliable operation and long service life. Specification: Item Type:Calculators Brand: BERM Product model: BEM-5C Power type: built-in battery Battery Model: AA R6P Voltage: 1.5V Capacity: 1500mA Range: 0-99999 (5 digits) Count the highest frequency: 50Hz Count Minimum Heart Rate Width: 1mS Maximum Resistance Contact: ≤1KΩ Contact breakage Minimum resistance: ≥500KΩ Purification Mode:Panel/External Operating environment temperature: -5℃ ~ 40℃ Size: 64 * 38 * 38mm / 2.52 * 1.5 * 1.5in Opening hole size: 63 x 36mm / 2.48 x 1.42in Package List: 1 x counter Package List 1 x Counter