This is the ElectriFly Silver Series 25 amp Brushless Electronic Speed Control. Great for medium sized, high performance airplanes. Delivering 25A of continuous current with a built-in Battery Eliminator Circuit which can handle 2A, this ESC is very simple to use and very affordable. FEATURES: Compatible with NiCd, NiMH and LiPo batteries Auto-detects input volts and sets Low-Voltage cutoff 8.5kHz switching frequency, for good run-time and cool operation Pre-installed Universal radio connector* (see Comments below) Pre-installed WS Deans Ultra male connector for battery (see comments below) Pre-installed gold plated 3.5mm female bullet connectors for motor High powered switching BEC (Battery Eliminator Circuit) which handles 3 or 4 standard servos Full proportional forward and smooth throttle response with ON/OFF brake Safe Start System** (see details in Comments below) Thermal Protection stops motor when maximum temperature 230°F is reached 180 Day Warranty (USA & Canada Only) INCLUDES: One Brushless ElectriFly Silver Series 25A Speed Control with pre-installed receiver connector, battery connector, and motor connectors. REQUIRES: Installing in airplane and connecting to receiver, battery and motor SPECS: Length: 1.58 (40mm) Width: 1.02 (26mm) Height: .31 (8mm) Weight: .92oz (26g) *updt* Input Voltage: 7-12 cells NiCd/NiMH ** 3-4 cells LiPo (20V input w/o BEC) Output Current: 25A continuous maximum 28A surge maximum Max Output Power: 250 watts ON-resistance: .15 ohms Operating frequency: 8.5kHz BEC: 5V/2A Low Voltage Cutoff: Battery voltage x .67 Thermal Cutoff: 230°F (110°C) Timing Angle: 12° Brake: ON/OFF