1. The protection board is widely used for most electric tools, vacuum cleaners, sweepers, electric scooters, electric bicycles and motorcycles on the market 2. More stable performance, stable charging and discharging performance, high and low temperature protection, overcurrent protection 3. When the product is short-circuited, it will automatically protect the three-proof silicone static protection and anti-silicone sealing performance is better Internal resistance protection circuit: 65Mohm Operating temperature range: -40~85°C Detection voltage: 4.28±0.035V Detection delay: 600-1700ms Release voltage: 4.08±0.05V Colour:blue Material:plastic Size: 45 x 20mm Package Contents: 30 x battery protection board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.