Features Lithium batteries are built-in. The theoretical life of the batteries can be as long as three years and the memory time is long. This is a digital counter, no mechanical wear, long service life, instead of electromagnetic counter. The product is equipped with LCD display and the reading is clearer. This product count accurately and reliably. Standard panel installation model, easy to install. Specification: Model: H7EC-NVInput voltage: DC 3-36V Counting format: 0-99999999 LCD display number: 8 digits Display type: LCD - black character External power supply: Do not (built-in 3V 800mA lithium-ion battery) Input: count input / reset input Reset: external reset / manual reset (minimum reset signal time 20ms) Working temperature: -10 - +55°C (no ice or condensation) Storage temperature: -25 - +65°C (no ice, condensation) Working humidity: 25~85% Panel opening size: 44.5MM*22.5MM Installation type: panel mounting Terminal Type: Screw Terminal Intrusion protection: IP66 - dustproof, water resistant Protection: IEC standard IP66, US NEMA standard type 4 (indoor) (but only panel surface) Anti-noise: Square wave noise generated by the noise simulator (pulse width 100ns, 1μs rises 1ns) Antistatic force: ±8kV (misoperation) Vibration durability: 10 ~ 55Hz, single amplitude 0.375mm, 3 directions, each 2h Malfunction: 10 ~ 55Hz, single amplitude 0.15mm, 3 directions, each 10min Impact durability: 300m/s2, 6 directions, 3 times eachPackage list: 1 * Counter Package List