1-8S Lipo Battery Voltage Tester 4 Pack, 2-in-1 RC LiPo Low Voltage Buzzer Alarm with LED Indicator, Battery Monitor Checker for 1-8S LiPo Li-ion LiFe LiMn Cells, High Precision ±0.01V

Specifications Voltage Detection Precision: plus or minus 0.01V Single Cell Voltage Display Range: 0.5V to 4.5V Total Battery Voltage Display Range: 0.5V to 36V Available Low Voltage Alarm Mode: 2S to 8S Adjustable Alarm Setting Range: OFF 2.5V to 3.8V Product Dimension: 4 cm x 2.5 cm x 1.1 cm Single Item Net Weight: 9g Applicable Battery Type: 1S to 8S LiPo Li ion LiFe LiMn batteries Features This multifunctional tester integrates real time battery voltage monitoring and low voltage alarm into one compact structure to meet daily battery inspection needs. It delivers precise voltage reading with built in reverse polarity protection to effectively avoid improper wiring caused battery over discharge and unnecessary component damage. Users can customize preset alarm value within available range once cell voltage falls below set threshold the device triggers continuous buzzer sound and flashing red LED for dual audio and light reminder. Adopting plug and play design the tester requires no complicated pre setup and works instantly after connecting with standard battery balance plug for convenient onsite or charging period inspection. It matches various RC hobby equipment including RC drone RC car helicopter FPV quadcopter and model aircraft for routine lithium battery status management. Package Includes 4 pieces of 1S to 8S low voltage buzzer alarm battery testers Note Factory default alarm voltage is set at 3.3V users need to press the control button under powered on state to finish alarm parameter adjustment. This tester only fits standard balance battery connectors and cannot work with non balance type battery plugs. Avoid long term storage under high temperature or humid environment to extend service life of the tester. • 🔋【4-Pack Voltage Testers】– Comes with 4 compact voltage checkers for RC batteries, ideal for monitoring your 1–8S LiPo, Li-ion, LiFe, and LiMn battery packs. A must-have accessory for every RC enthusiast. • 📢【2-in-1 Alarm & Monitor】– Functions as both a battery voltage tester and a low voltage alarm buzzer. Automatically detects cell count and individual cell voltages, with alarm value adjustable from 2.5V to 3.8V. • 📏【Compact & Lightweight】– Each unit measures only 4 × 2.5 × 1.1 cm and weighs just 9g. Easy to carry and install in RC models, drones, planes, cars, or use at your battery workstation. • ⚙️【Plug and Play】– Simply insert the battery's balance plug, and the device will auto-display the total voltage and individual cell voltages. Supports reverse polarity protection for safe operation. • 🚨【Low Voltage Alarm with LED】– When voltage drops below the set level, the buzzer sounds and the red LED flashes to alert you. Default setting is 3.3V, adjustable via single button, saved automatically.