Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lockey M210 Keyless Deadbolt

Wonderful lock! I love being keyless!This lock is totally mechanical, no batteries ever. It has a heavy 1 inch throw bolt which can be used to replace a normal deadbolt.The combination is set with color coded pins inserted in the back of the lock. You can set the lock right or left handed by moving a single pin. If you want to increase the number of combinations you can make, buy a set of extra pins for about $8.I bought the EZ mount kit ($15) which made installation a breeze - no drilling. All I needed was a screwdriver to swap out the existing deadbolt with the new keyless lock. I installed three of these in about 10 minutes.The lock has a universal backset which is usually set to 2 3/8. If you need the larger 2 3/4, pull up on the pin while pulling out on the hole until it clicks into place.