I i boght one pair but when i press the b & c button together as the instruction says, the led does not light up. what is the problem? dead battery o

I have the same problem with the batteries. I have replaced them twice, both times the battery lasts about 10 days. This is not worth it.

Does it work for a linear garage opener?

Hi, this garage door remote is not compatible with Linear garage opener.

Could i glue a visor clip to the back so I can clip it to my pocket when I go for a walk ?

Hi, there are some bumps on the back of this remote, so if you need to glue on a clip it might be a little difficult.

Hello, to install this control, I must first delete the engine codes? or is it not necessary?

I’m not sure what you mean by engine codes. However, the control will read and program itself to the garage door opener codes. Check the bottom of the remote control webpage on Amazon for directions,

Compatible Devices	81LM、82LM、83LM、371LM、372LM、373LM、374LM、971LM、972LM、973LM、974LM、891LM、893LM、893MAXリモコンの交換。, Liftmaster / Chamberlain/ Sears Craftsman/ Raynor/ AccessMaster ガレージドアオープナー。
Color Name	グリーン、オレンジ、パープル、レッド、イエロー。
Batteries Included	Yes
Batteries Required	Yes
Brand	OTLEER
Manufacturer	s
Item Model Number	i11-MAX
Special Features	スライドカバー。
Connectivity Technology	RF方式
Material	プラスチック。
Item Weight	37 Grams

ユニバーサルガレージドアリモコン Liftmaster Chamberlain Craftsmanオープナー用 5色の学習ボタン パープル イエロー グリーン オレンジ レッド キーチェーン付き 2個パック

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ユニバーサルガレージドアリモコン Liftmaster Chamberlain Craftsmanオープナー用 5色の学習ボタンパープルイエローグリーンオレンジレッドキーチェーン付き 2個パック