DLP Tactical Precision Laser Sight for Glock Gen 3 & 4 Full Size & Compact Pistols in FDE TAN (fits G 17 19 20 21 22 23 31 32 34 35 37 38) Compact Laser Sight Attaches To Trigger Guard and Frame Rails for Maximum Stability Limited Edition FDE TAN color Powerful 5mW 650nm Red Laser Diode, Class III A/Class 3R with Ambidextrous Micro-Switch On/Off Activation Installs with no modifcation to your pistol needed Powered by 1 CR2032 battery (included)